Answer:
The area of the figure is 63.25 square feet
Step-by-step explanation:
we know that
The area of the figure is equal to the area of semicircle plus the area of triangle
step 1
Find the area of semicircle
The area of semicircle is

we have
----> the radius is half the diameter

substitute


step 2
Find the area of the triangle
The area of triangle is equal to

we have

substitute


step 3
The area of the figure is equal to

substitute

It means 3 is multiplied by x
R-4+3r-16=180
4r-20=180
4r=200
r=50
Angle D
r-4
50-4
46
Angle E
3r-16
3•50-16
150-16
134
A=7d+13
A=7(4)+13
A= 28+13
A=41
No its not because its a repeating decimal for a number to be a irrational number it has to be non terminating or non repeating