Question

If the Diameter of a circle is 20, please find:

-The radius
-The circumference
-The area

Remember that the formula for circumference is: C+Pi x diameter
The formula for area is: A = Pi x radius squared

Answer 1

Radius = 10

Circumference = 62.83

Area = 314.16

Explanation:

To find radius divide diameter by 2

To find Circumference multiply 2 × Pi × Radius

To find Area Square the Radius then multiply by Pi

(Use radius for each)

Answer 2

The radius of the circle is 10 because the radius is basically the half of the diameter. If you get a question where gives you the diameter and asks you the radius, all you need to do is to divide the diameter by 2.

For example: If the diameter of the circle is 50 then the radius is 25.

Radius: 10

To get the circumference of this circle, just simply do π (3.14) x 20 which should give you the answer "62.8".

Circumference: 62.8

To get the area of this circle, you need to divide the diameter by 2 (which gives you 10) and then do 10 squared x 3.14 (which gives you 314).

Area: 314