Question

Which figure shows a radius?

Answer 1

Now that you know how to calculate the circumference and area of a circle, you can use this knowledge to find the perimeter and area of composite figures. The trick to figuring out these types of problems is to identify shapes (and parts of shapes) within the composite figure, calculate their individual dimensions, and then add them together.

For example, look at the image below. Is it possible to find the perimeter?

Answer 2

The first option

Explanation:

The radius is a straight line from the center of a circle to a circumference, so if the question asks for the radius, it wants a circle with a line half way through the circle.