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

Tutors Answer Your Questions about Circles (FREE)

Question 642847: what the diameter of a circle is 44 millimeter.what is its radius
Click here to see answer by Alan3354(69443)

Question 644128: The circumference of a circle is 12 inches. Find it's radius and area.
Click here to see answer by lynnlo(4176)

Question 645378: The area of a sector of a circle is 44cm. What is the radius of the circle if the angle at the centre of the circle is 140?
Click here to see answer by nerdybill(7384)

Question 645433: given C(6,1) x-intercept is 2 find the equation of a circle
Click here to see answer by Alan3354(69443)

Question 648057: how many centimeters are in 10 in?
Click here to see answer by Algebraic(50)

Question 648986: What is the center and radius of (x-3)^2+(y-1)^2=36?
Click here to see answer by MathLover1(20849)

Question 650021: find the length of a radius of a circle whose area and circumference are the same non zero number
Click here to see answer by swincher4391(1107)

Question 650021: find the length of a radius of a circle whose area and circumference are the same non zero number
Click here to see answer by MathLover1(20849)

Question 650877: what is the center and the equation of x2+y2+16x+6y+9=0
Click here to see answer by ewatrrr(24785)

Question 652668: Find the equation of the circle with center at the origin and tangent to the line 4x+3y=10.
Click here to see answer by solver91311(24713)

Question 652673: A circle centered at the origin whose radius is 2 units is inscribed in a right triangle whose base is 8 units and altitude 6 units. Find the equation of the circle.
Click here to see answer by Edwin McCravy(20054)

Question 652851: Write the equation of the circle in standard form. Find the center, radius, intercepts, and graph
Click here to see answer by reviewermath(1029)

Question 653769: (3,-7) is the center of a circle and the point (8,5) is on the circumference of the circle
a 13π
b 15π
c 18π
d 25π
e 26π
Click here to see answer by lynnlo(4176)

Question 654959: find the equation of acircle given the center c(-4,6) passing through p(1,2)
Click here to see answer by MathLover1(20849)

Question 657802: find the diameter of a circle with a circumference of 46(pi)m.
Click here to see answer by MathLover1(20849)

Question 660534: What do they mean when they say "Write the equation of a circle with radius equal to square root 2 and center at (2, 5)." I understand how to set up the equations but what's throwing me off is the radius equal to square root 2. What does that mean?
Click here to see answer by stanbon(75887)

Question 661242: a bicycle tire has a diameter of 2 feet. How many revolutions will it make in going a distance of 50 feet?
Click here to see answer by Alan3354(69443)

Question 661569: Find an equation of the circle with center at the origin and passing through (−2−2) in the form of
(x−h)^2+(y−k)^2=r^2 where hkr are constants.
I found radius of 8^(1/2).
h & k are not (2, 2) or (-2, -2). I'm thinking h & k are (4, 4), because it equals to the radius. Please find h & k, thank you!
Click here to see answer by lwsshak3(11628)

Question 661589: Please help me figure out this problem: 2x^2+2y^2+16x+8y−32=0 is the equation of a circle with center (h,k) and radius r for: h, k, and r
I got 2(x^2-8x+16) + 2 (y^2 + 4y + 4) = 32 +16 +4
divide by 2: (x-4)^2 + (y+2)^2 = 26
(4, -2) and radius of sqrt 26 or 5.09901951
my homework page has confirmed that only -2 was correct. Where did I make a mistake?
Click here to see answer by lwsshak3(11628)

Question 662627: Find an equation of the circle that has center C(3, −4) and is tangent to the line y = 3. (Give your answer in standard notation.)
Click here to see answer by Alan3354(69443)

Question 663657: sir/maam can u give some examples of problems in finding the intersection of the two circles given the equation of the circles.
Click here to see answer by Edwin McCravy(20054)

Question 664492: I have the Lat Lon coordinates of three points that lie on a large circle (radius somewhere between 12-15 miles). How can I find the Lat Lon of the center of the circle? The differences in elevation are less than 100', so I assume one can assume flat earth.
I'm not even certain as to how to try this, as I've been out of school over 40 years and most things of this sort that I learned are pretty well gone at this point.
Click here to see answer by KMST(5328)

Question 664730: Draw the outline of the unfolded figure needed to construct a right square pyramid whose base has side length 5.
---I tried drawing this but I just cannot figure it out!! Someone please help. My midterm is tomorrow.
Click here to see answer by stanbon(75887)

Question 664940: If the arc on a particular circle has a length of 3 units, and the degree measure of the arc is 30o, which is the circumference of the circle?
Select one of the options below as your answer:
A. 3 units
B. 6 units
C. 12 units
D. 36 units
Click here to see answer by Alan3354(69443)

Question 665773: how do i find the equation of the line tangent to the circle x^2+y^3=13 at the point (-2,3). write the answer in slope-intercept form.
Click here to see answer by mananth(16946)

Question 666051: Points (1, 5) and (-7, 9) are endpoints of the diameter of a circle.
What is the length of the diameter?
What is the center ofthe circle?
What is the equation of the circle?
Click here to see answer by ewatrrr(24785)

Question 667257: Line segment AB intersects line segment ED in the middle at the point C
If DC=6+x and CE=2x+1, find the value of x
Click here to see answer by ewatrrr(24785)

Question 667686: find the area of the circle whose equation is
x^2+11x+y^2-5y=1
so far i have completed the square and gotten
(x^2+11x+121/4)+(y^2-5y+25/4)= 75/2
Click here to see answer by mananth(16946)

Question 668370: PROBLEM:
A Cylindrical soup cup is 4 inches in diameter. h=v/(pi x r to the second power)
(use the value pi = 22/7
How many inches high must it be to hold 2 cups (28 7/8 cu. in.) if an additional 1/2 inch is added to height for the rim?
Click here to see answer by Alan3354(69443)

Question 668756: In circle O, a diameter has endpoints (-5,4) and (3,-6). What's the length of the diamter?
Click here to see answer by jim_thompson5910(35256)

Question 669435: find an equation of a circle that tangent is to 3x+4y-15=0 at (5,0); contains (-2,-1)
Click here to see answer by KMST(5328)

Question 669587: Find the center of the circle described by the following equation-
2(x+10)^+2(y-10)^2=18
Click here to see answer by ewatrrr(24785)

Question 671730: find the radius when the arc length is 16 cm and the angel is 75 degrees
Click here to see answer by mananth(16946)

Question 671798: Give the center and radius of the circle described by (x-1)^2+(y-2)=4
Click here to see answer by ewatrrr(24785)

Question 671798: Give the center and radius of the circle described by (x-1)^2+(y-2)=4
Click here to see answer by MathLover1(20849)

Question 672437: Find an equation of the circle that has center (-1, 1)and passes through(-5,6)
Click here to see answer by DrBeeee(684)

Question 672444: Find an equation of the circle whose diameter has endpoints (-5,6) and (-3,-4)
Click here to see answer by DrBeeee(684)

Question 672786: The circle (x � 4)2 + (y � 3)2 = 4 has centre C and radius r.
The line y = x + 1 intersects this circle at two points A and B.
Find the coordinates of A and B.
Some working out would be appreciated to learn for next time :D
Thanks in advance
Click here to see answer by stanbon(75887)

Question 673575: find the circumference of a circle with a radius of 6cm
Click here to see answer by Alan3354(69443)

Question 673594: Find the area of a circle with a diameter of 22 inches
Click here to see answer by rfer(16322)

Question 674438: What is the diameter of the circle given by the equation x^2 - 18x + y^2 + 14y = -105?
Click here to see answer by solver91311(24713)

Question 677632: Find the area contained between three circles of radius 20 centimeters, each of which is externally tangent to the other two.
Click here to see answer by sachi(548)

Question 678210: Two concentric circles have circumferences 30pi & 40pi. Find the area of the ring-shaped between them.
What are my steps to solving this problem?
Click here to see answer by pmatei(79)

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