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

Tutors Answer Your Questions about Circles (FREE)

Question 418022: what is the exact area of a circle witha a diameter of 25 inches

Click here to see answer by Gogonati(809)

Question 418022: what is the exact area of a circle witha a diameter of 25 inches

Click here to see answer by praseenakos@yahoo.com(507)

Question 418483: What is the area, circumferance, and perimeter of a square with a shaded circle inside the sides measure 4cm
Click here to see answer by aaronhunter(3)

Question 418705: A bicycle tire has a radius of 16 inches
a.how many inches does the bicycle travel in one revolution of the tire?What is the formula
b.if you have to replace your tires every 1000 feet, how many revolutions can you get?
Click here to see answer by rfer(12654)

Question 418786: If a circle has a radius of 6inches what is it's approximate circumference.
Click here to see answer by praseenakos@yahoo.com(507)

Question 418612: given a circle with a radius of 16 ft,and a centeral angle of 135, find the lenth of the arc created by
Click here to see answer by ankor@dixie-net.com(15645)

Question 419405: using 3.14 for pi and r = 9in c = ? (rounded to the nearest hundredth)
Click here to see answer by duckness73(43)

Question 419596: Let a quadrilateral be given with sides a, b, c, and d. Suppose the quadrilateral is cyclic, and that it also has a circle inscribed in it. Show that its area is given by sqrt(abcd).
Brahmagupta's Formula
Area^2=(s-a)(s-b)(s-c)(s-d), where s is the semi perimeter.
Click here to see answer by richard1234(5390)

Question 419829: If the area of a piece of pie is one-third the area of the entire pie, what is the number of degrees in the central angle of the piece of pie? Also please explain your answer.
Click here to see answer by Gogonati(809)

Question 419841: How the find the area of 5/9 of the circle with radius = 16
Click here to see answer by MathLover1(6625)

Question 420133: Find the circumference and area of the circle whose equation is
(x-9)^2 + (y-3)^2 = 64. Leave the answer in the terms of pi
Click here to see answer by robertb(4012)

Question 420187: if the wheels are attached by a chain and the larger wheel spins 5 times, how many times will the smaller wheel spin? little r=4in (little circle), big r=10in (big circle)
Click here to see answer by josmiceli(9664)

Question 420197: How do you calculate the shaded area inside the circle of perimeter 50 pi units?
Click here to see answer by Theo(3458)

Question 421657: in a circle with radius 6 cm, find the exact area of a sector whose central angle measure 120 degrees.
Having a hard time with this.
Click here to see answer by MathLover1(6625)

Question 421878: Prove that the graph of any equation of the form y=ax^2+bx+c has exactly one y-intercept.
Click here to see answer by Theo(3458)

Question 422030: What is the perimeter of the smallest box that this record can fit into with a circumference of 8 inches? URGENT!!!
Click here to see answer by Theo(3458)

Question 422168: I was given a probem with radius of 5 meters and angle of 68.75493542 degrees.what are the x and y intercepts?
Click here to see answer by stanbon(57282)

Question 422235: DRAW 2 CONCENTRIC CIRCLES. tHE LARGER CIRCLE HAS A RADIUS THAT IS 18 INCHES LONGER THAN THE SMALLER CIRLCE. THE LARGER CIRCLE HAS A CIRCUMFERENCE THAT IS A PI FEET LARGER THAN THE SMALLER CIRCLE. FIND THE VALUE OF A.
Click here to see answer by mananth(12270)

Question 422331: Find the center and radius of the circle.
(x - 3)^2 + (y + 5)^2 = 9
Click here to see answer by Gogonati(809)

Question 422354: a circle has a radius of 8 find its area
Click here to see answer by algebrahouse.com(1079)

Question 422438: Find the circumference of a circle with a diameter of 3 inches (use 3.14 for p).
Click here to see answer by stanbon(57282)

Question 422698: A circle with a diameter of 6 inches has its center at the center of a square with 6-inch sides. Find the area of the region that is inside the square and outside the square. Use 3.14 for Pi
Click here to see answer by rfer(12654)

Question 422843: What is the radius of a circle whose diameter is
Click here to see answer by blwinbbbles(106)

Question 422843: What is the radius of a circle whose diameter is
Click here to see answer by richard1234(5390)

Question 425059: The width of a rectangle is 5 feet, and the diagonal is 8 feet. Which is the area of the rectangle? (Round to nearest hundredth.)

Click here to see answer by emargo19(101)

Question 425088: Professor Pete Fly ate an entire pizza one night Each time he took a bite 9 square centimeters of pizza disappeared Professor Fly was so hungry that once he started eating he culd not stop. Twenty eight minutes later the pizza was finished. He took 20 seconds to lift the pizza to his mouth, take a bite, chew it and swallow it. He never paused until he was done. To the neares INCH, what was the diameter of the pizza he ate?
How do I solve this?
Click here to see answer by scott8148(6628)

Question 426295: how do i find the area of a circle

Click here to see answer by solver91311(16872)

Question 426383: how do i solve this problem??
"if a circle has an area of 81 pi inches squared what is the circumference. leave your answer in terms of pi."
Click here to see answer by mananth(12270)

Question 426443: The real-life train that Joe modeled his train set
after crosses a circular pond with radius 20.5 feet.
How big of a circle should Joe draw to represent this
pond in his model train set, if he is to stay consistent
with the 1:12 ratio?
Click here to see answer by edjones(7569)

Question 427443: A team in science class placed a chalk mark on the side of a wheel and rolled the wheel in a straight line until the chalk mark returned to the same position. The team then measured the distance the wheel had rolled and found it to be 16p cm. What is the area of the wheel?
this is a practice test so the only possible answers (according to the test) for the question are:
a. 64p cm2
b. 16p cm2
c. 8p cm2
d. 32p cm2
Click here to see answer by ewatrrr(10682)

Question 427882: How do we find other points on a circle when given only one point?
ex: If I know a point is (3,-5), what is the point opposite from it with a center of (0,0)?
Click here to see answer by Alan3354(30993)

Question 427908: If the circumference of a circle is 5/2 pi inches, how many inches long is it's radius
A. 2/5
B. 4/5
C. 5/4
D. /2
E.
Please help..I'm sorry if I didn't put the formulas for the answer choices right I'm new
Click here to see answer by stanbon(57282)

Question 429282: find the circumferemce and area of the circle having the given diameter. USE 3.14 π.d=14.80 km
Click here to see answer by rfer(12654)

Question 429662: Calculate the shaded area inside the circle of perimeter 50pi units.

Click here to see answer by ewatrrr(10682)

Question 430041: find the grade point average. Assume that the grade point values are 4.00 for an A, 3.00 for B and so on
grades.........# of credit hour
B.................4
B.................4
B.................3
C.................3

teacher said the answer is 2.29.. plzz can u explan how did she gets 2.29.
Click here to see answer by jorel1380(2518)

Question 430088: find the grade point average. Assume that the grade point values are 4.00 for an A, 3.00 for B and so on
grades.........# of credit hour
B.................5
B.................3
C.................4

Click here to see answer by Theo(3458)

Question 430112: I want to bend a 12 foot sheet of Plexiglas into a circle - what will the diameter of that circle be?
Click here to see answer by algebrahouse.com(1079)

Question 430314: What is the relationship between a central angle of a circle and its intercepted arc
Click here to see answer by stanbon(57282)

Question 430893: Pie Chart percentage question.Thank you for taking the time to answer this question.There are 130 students. 68 like chocolate ice cream. 52 like Vanilla. I want to know what percentage like each flavor. I thought 68/130=52% and 52/130=40%
Why doesn't the total = 100%? The answer should be 57% chocolate and 43% vanilla??? How is that done? and what did I do wrong???? Thank you so much for your time and more important your knowledge.
Click here to see answer by josmiceli(9664)

Question 431221: find the area of each circle to the nearest hundred. use 22/7 for pi. A=?
r=7ft.
Click here to see answer by algebrahouse.com(1079)

Question 431397: Question 4
Part a) Given three noncollinear points, construct the circle and then write the equation of the circle.
The points are A (12,-1), B (6,-3), C (4, 3).
Part b) Using the equation and graph of the circle above, determine if the following lines are tangent, secant or neither.
y=1
y=2x-1
Question 5
Given AC is a diameter of circle O.
AC = 25 cm, measure angle A= 7x+8 and measure angle B = 4x+20. Find the length of arc BC to the nearest tenth.
*Image is not drawn to scale.
Question 6
ABCD is an inscribed quadrilateral. Find the measures of angles A, B, C, D.
*Image is not drawn to scale.
Question 7
Find the area and perimeter of the great circle in the sphere with a radius of 12m.
Question 8
Frederick is paddling due east on the river at 4 mph. However, the river is flowing due north at 2 mph, find the resultant direction and velocity (magnitude) of his canoe
Click here to see answer by Alan3354(30993)

Question 432359: in the diagram, RS is a radius of circle R. Is ST tangent to circle R? Explain
Click here to see answer by solver91311(16872)

Question 432736: How to find the circumference of the circle whose equation is given as x^2 + y^2 = 9
Click here to see answer by Alan3354(30993)

Question 432793: each polygon is circumscribed in a circle. find the perimeter of the polygon.
lengths are 2.5m, 4m, 5.8m, and 8m
Click here to see answer by richard1234(5390)

Question 432883: Find the center and radius of the circle.
(x - 4)2 + (y + 6)2 = 16
Please help
Click here to see answer by sudhanshu_kmr(1152)

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