When a circle's radius triples, what happens to its area?
A = πr^2
When r = 3r, then we have:
a = π(3r)^2
A = 9(πr^2)
This means Area increases...
What is the formula for the circumference of a circle?
Given radius r and diameter d, the circumference C is:
C = 2πr or πd
What is the formula for the area of a circle?
Given a radius r, we have Area (A) of:
A = πr^2
What is the ratio of the area of a circle to the area of a square drawn around that circle? Express your answer in terms of pi.
Area of a circle...
Laura found a roll of fencing in her garage. She couldn't decide whether to fence in a square garden or a round garden with the fencing.
If the diameter of a circle is n, what is the circumference?
Diameter of a circle = pi(d)
Given d = n, we have:
Diameter = pi(n)
A dog on a 20-foot long leash is tied to the middle of a fence that is 100 feet long. The dog ruined the grass wherever it could reach. What is...
Fantasia decided to paint her circular room which had a diameter of 25 feet. She started painting in the center and when she had painted a circle...
A circle has a center at (6, 2) and passes through (9, 6)
The radius (r) is found by using the distance formula to get:
r = 5
And the equation...
a painter is painting a circular sculpture. The sculpture has a radius of 5 meters. How much paint should she use to paint the sculpture
center (3, -2), radius = 4
To see the general form or standard form, you can check out this link:...
If the circumference of a circular rug is 16π feet, then what is the area of the rug in terms of pi
C = 2pir, so we have:
C = 16π
16π = 2πr...
3/10 of a circle equal how many degrees
A circle is 365 degrees. So we multiply 365 * 3/10 in our search engine and get:
219/2 = 109.5 degrees
(3,3) radius of 4
We have a circle with center (3,3) with a radius of 4.
Use our circle equation calculator to get the general form and standard...
Marco orders a large pizza, with a diameter of 14 inches. It is cut into 8 congruent pieces. what is the area of one piece?
A pizza is a circle....
A gardener wants to fence a circular garden of diameter 21cm. Find the length of the rope he needs to purchase, if he makes 2round of fence Also...
A tractor tire has a radius of 24 inches. If the tire rotates one time around, about how many inches of ground will it cover? Use 3.14 for pi.
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