50 pts!!! Find the area of the shaded regions. Give your answer as a completely simplified exact value in terms of pi (no approximations)

Step-by-step explanation:

Area of circle:

Area of α degree sector:

The shaded area is:

4th option is correct xy=-10

if this was to u plzz mark me the brainliest

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet