A state seal, which is round, hangs in the capitol building. It has a diameter of 4 meters. What is the seal's radius?

Hi! 

The diameter is the length across the perimeter of the circle, while the radius is the length from the perimeter to the center. This makes it so the radius is always half of the diameter.

So to figure out the answer to this, you just have to split 4 in half. 

4 ÷ 2 = 2

Answer: The radius is 2 meters

Hope this helps :)