Do the necessary measurements with the ruler.

You can move the rulers from their ends, one after the other.

Type the numbers in each window below, then hit Enter.

In order to check if your answer is correct, you have to enter the unit. You can do this by dragging the correct units to the yellow circles with the cursor.

This exercise is silmilar to the previous one, but here you have to use the measurement of the radius instead of the diameter.