Question

An asteroid has hit the Earth and created a huge crater. Engineers and scientists hove measured around the crater to be 79.5 miles. How much of the surfoce of the Earth hos been effected by the crater impact?

Answer 1

The measurement around the crater is the circumference. We need to find the radius so we can find the area fo the crater.
$C= 2\pi r$

Plug in values
79.5=2*(3.14)r

Multiply 2 and 3.14

79.5 = 6.28r

Divide both sides by 6.28

r approximately 12.66 miles

Area of a circle 

$A= \pi r^2$

Plug in values

A=(3.14)*12.66^2

Area = approximately 503.27 Sq Miles