Answer:
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
