480 sayisinin kac tane asal carpani vardir? a)2 b)3 c)4 d)5

Imagine a circle, split this circle down the middle. That is your circumference. Now split that line in half too, that is your radius add the number given in your paper next to your diameter same with the radius. Now here is the formula:

pier2 (3.14 X radius X squared) RADIUS

2pie2 (2 X 3.14 X squared) DIAMETER

2r (2 X radius) DIAMETER

draw this out if it helps!!