Question

HEP HELP IT WOULD MEAN SOMETHING TO ME FIND THE AREA OF THE BLUE SHADED REGION

Answer 1

The rectangle they created has an area of 20*36=720
but you need to subtract the half circle area so use pi * r ^2
pi(18)^2pi = 324pi 
half this area for the circle because only half of the circle is in the rectangle area we found.
so then 720 - (162pi) = blue shaded area

Answer 2

Area of the rectangle:720
area of half circle:254.34
720-254.34=465.66