The diagram shows a semicircle with centre O
and radius
2
and a semicircular arc with diameter
P
R
.Angle P O R is a right angle.

What is the area of the shaded region?

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft

step-by-step explanation:

for volume, add base x height x width