Questions on Geometry: Circles and their properties answered by real tutors!

Tutors Answer Your Questions about Circles (FREE)

Question 613717: 2.
If the radius of a circle is 15 cm, what is the diameter?

A. 7.5 cm
B. 20 cm
C. 60 cm
D. 30 cm
3.
If the diameter of a circle is 5, what is the radius?

A. 25
B. 2.5
C. 10
D. 15
4. Which of the following is a secant in the picture?

A.
B.
C.
D.
5.
What do you know about and . Be specific.

A. They are congruent.
B. They are perpendicular.
C. All of the above
D. None of the above
6. Find x.

A. 3
B. 3.6
C. 3.9
D. 4.2
7. Given, circle O with AB = CD. Find x.

A. 16
B. 15
C. 9
D. 6
8.
Using the diagram below, calculate the length of GB if AB = 14 cm.

A. 7 cm
B. 3.5 cm
C. 6 cm
D. 8 cm
9.
Using the diagram below, calculate the length of .

A. 25 in
B. 4 in
C. 7 in
D. 5 in
10.
Calculate the length of AD given AB = 7 cm, AC =15 cm, and AE = 20.

A. 3.25
B. 5.25
C. 2.50
D. 5.50
11. Given: circle with two secants, find x.

A. 5
B. 10
C. 20
D. 28
12.
If AD = 6.5 and AB = 6, calculate length of . Segment AC is tangent to circle D.

A. 17
B. 2.5
C. 25
D. 5
13.
If AB = 2.5, CD = 3, and FE = 5, calculate the values of and . All lines that appear to be tangent to the circle are tangent to the circle.

A. AE = 7.5 and CE = 8
B. AE = 8 and CE = 7.5
C. AE = 8.25 and CE = 7.75
D. AE = 7.75 and CE = 8.25
14.
If AC = 25 mm and AB = 15 mm, calculate the length of AD.

A. 16 mm
B. 15 mm
C. 9 mm
D. 14 mm

Click here to see answer by Alan3354(30993)

Question 613697: if the diameter of my circle is 7'4" whats is the total amount of steel used?

Click here to see answer by ewatrrr(10682)

Question 614055: Could someone please help me with this problem?
What is the appoximate circumference of the largest circle that could be cut out of an 8 1/2-inch by 11-inch piece of paper? Use 3.14 for pie and round to the nearest inch.
A. 27 in.
B. 53 in.
C. 69 in.
D. 227 inches
Click here to see answer by ankor@dixie-net.com(15664)

Question 614429: in circle C, QR is the diameter, and Q(1,8) and C(3.5,2) aer the points on a coordinate plane. Find and state the coordinates of point R. the other end of the diameter.
Click here to see answer by ewatrrr(10682)

Question 614586: write the equation of a circle ,in standard form, whose endpoints of its diameter (-3,2) and (3,-6)
Click here to see answer by ewatrrr(10682)

Question 614579: what is the general form of the equation of a circle below
(x-4)^2+y^2=16
1)x^2+y^2-8x-16=16
2)x^2+y^2-8x+16=16
3)x^2+y^2-8x=0
4)x^2+y^2+8x=0
Click here to see answer by ewatrrr(10682)

Question 614575: Find the circumference of the circle given by the equation (x-3)^2+(y+8)^2=300. Find the circumference in terms of pi
Click here to see answer by asuar010(324)

Question 615651: This is a problem on my Geometry Study guide for the final exam:
SR is a diameter of circle M.
Measurement of angle RMT = (x+5)degrees,
measurement of angle UMR = (x+10)degrees, and
measurement of angle SMT = (3x-5)degrees.
What is the value of x?
The answer is 45 but I do not know how to solve this problem.
Thank you
Click here to see answer by MathTherapy(1430)

Question 615898: Name a central angle using the diagram below
Click here to see answer by solver91311(16897)

Question 616148: The circumference of a circle equals 69.08 units. What is the circle's diameter?
Click here to see answer by unlockmath(1603)

Question 616183: katrina is retiling her kitchen floor she is putting a circular design in the center that measures 6 feet in diameter what is the area of the tile circle to the nearest square foot. EDIT you had 3.14 in the word 'center' so assume that you were told to use 3.14 as the value of ?
Click here to see answer by dragonwalker(72)

Question 616274: True or false: The circle x^2 + y^2 = 7 has radius 7. If false, give the correct value of the radius.
Click here to see answer by jim_thompson5910(28598)

Question 616272: Describe the relationship between a central angle and its intercepted arc
Click here to see answer by Alan3354(30993)

Question 616277: Write the equation of a circle with center (h,k) and radius r
Click here to see answer by richard1234(5390)

Question 616356: What is the center and the radius of a circle whose equation is x^2+y^2 -4x +14y +28=0 ?
Click here to see answer by lwsshak3(6524)

Question 616347: Each circle is tangent to the other two. If the diameter of the large circle is 12, the area of the shaded region is ________?
Click here to see answer by Alan3354(30993)

Question 616392: a certain cars windsheild wiper clears a portion of a sector as shown at right. if the angle the wiper pivots during each swing is 120 degrees, find the area of the windshield that is wiped during each swing.
Click here to see answer by Alan3354(30993)

Question 616846: a wedged-shaped piece is cut from a circular pizza. the radius of the pizza is 6 inches. the rounded edge of the cust of the piece measuures 4.2 inches. to the nearest tenth the angle of the pointed end of the pizza in radians is ?
Click here to see answer by jsmallt9(3296)

Question 616919: find the center of the circle using these three points (-4,4),(-7,3),(-8,2)
Click here to see answer by richwmiller(9143)

Question 616919: find the center of the circle using these three points (-4,4),(-7,3),(-8,2)
Click here to see answer by EdwinParker(16)

Question 616977: Suppose the circumference of a circle is 15π. What is its diameter?
Click here to see answer by solver91311(16897)

Question 617034: A circular flower garden has a radiusof 16 feet. You want to lay a circular sidewalk 2 feet wide around the entire garden. If the walk will be 3 inches thick, how many cubic yards of concrete will you need?

Click here to see answer by richwmiller(9143)

Question 617029: A gardener wants three rosebushes in her garden to be watered by a rotating water sprinkler. The gardener draws a diagram of the garden using a grid in which each unit represents 1 ft. The rosebushes are at (1, 3), (5, 11), and (11, 4). She wants to position the sprinkler at a point equidistant from each rosebush. Where should the gardener place the sprinkler? What equation describes the boundary of the circular region that the sprinkler will cover?

Click here to see answer by richwmiller(9143)

Question 618306: x^2+y^2+6x-8y-155=0
Find the radius and the center of the circle. For the radius use radicals as needed for an exact answer. For the center type in an ordered pair using fractions and integers as needed.
Click here to see answer by lwsshak3(6524)

Question 618616: One circular table has a diameter of 9ft, and another circular table has a diameter of 14ft. How much greater is the area of the larger table? round to the nearest whole number.
Click here to see answer by lwsshak3(6524)

Question 618718: What are the properties of a circle?
Click here to see answer by richwmiller(9143)

Question 619157: Write the equation of a circle in standard form. find the center, radius, intercepts, and graph the circle. x^2+y^2+16x+18y=-129
Click here to see answer by ewatrrr(10682)

Question 619283: question if the circumference of a cicle with r by c=2nr and n= 3.14 find the circumference when r = 15 meters, so far I have radius = 15 and n= 3.14 so r= 2*15 = 30 Im stuck....I just want to know if on right track.
Click here to see answer by stanbon(57415)

Question 619380: "How do you find x and y intercepts to 5y = 20"
Click here to see answer by Theo(3472)

Question 619874: Find the area of a circle whose diameter is 80 cm. Use pi = 3.14
Click here to see answer by Alan3354(30993)

Question 620306: if a circle has an area of 914 cm how long is the radius and diameter?
Click here to see answer by Alan3354(30993)

Question 620305: if a circle has an area of 914 cm how long is the radius and diameter?
Click here to see answer by Alan3354(30993)

Question 620911: If the area of a circle and its circumference have the same numerical value, what is the length of the radius?
Click here to see answer by solver91311(16897)

Question 621378: Train A leaves the platform at 5 pm at a speed of 120 km/h and train B leaves the same platform on a parallel track in the same direction at 7 30 pm at 144 km/h. After how many hours will train B cross train A?
A)12.5
B)15
C)17.5
D)18
E)20
Click here to see answer by ewatrrr(10682)

Question 621379: Machine A can print 20 posters in a minute and machine B can print 15 posters a minute. How long will it take both of machines to print 945 if they work together?
A)23
B)27
C)29
D)31
E)33
Click here to see answer by ewatrrr(10682)

Question 621381: Which of the following lines is equidistant fro the points (3,8) and (9,6)?
A)x=1/3
B)y=3
C)y=x/3
D)y=-x/3
E)y=3x+8
Click here to see answer by ewatrrr(10682)

Question 621381: Which of the following lines is equidistant fro the points (3,8) and (9,6)?
A)x=1/3
B)y=3
C)y=x/3
D)y=-x/3
E)y=3x+8
Click here to see answer by Alan3354(30993)

Question 621966: equations of a circle with center(-3,0)and radius 20
Click here to see answer by ewatrrr(10682)

Question 622071: A circle that has a radius of 3 meters has a diameter of?

Click here to see answer by vleith(2825)

Question 622955: An equilateral triangle of length 9 cm is inserted in a circle .Find the radius of the circle.
Click here to see answer by mykasha(37)

Question 624039:
Hi
How would you slove this Given DC is a tanent of point e ae =20 and dc =9 what is the measurement of ac
Thank you
Click here to see answer by Alan3354(30993)

Question 625342: How to solve or how to find the central angle?
Click here to see answer by Alan3354(30993)

Question 625348: A circle has its center at the center of a square with 12-inch sides. Using 3.14 for pi, find the area of the square not covered by the circle, then write a ratio of the circle’s circumference to the perimeter of the square.
Click here to see answer by Alan3354(30993)

Question 626093: Find the center and radius of the circle. Write the standard form of the equation.
(4,6); (9,6)
Click here to see answer by Alan3354(30993)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295