Determine the area of each polygon below

Part 1) the polygon is a triangle and a rectangle
area=area triangle+area rectangle

step 1
find the area of the triangle
area triangle=b*h/2
b is the base> b=8-2-1> b=5 cm
h is the height> h=5 cm
area triangle=5*5/2> 12.5 cm²

step 2
find the area of the rectangle
area rectangle=b*h
b is the base> b= 8 cm
h is the height> h=5 cm

area of rectangle=8*5> 40 cm²

step 3
find the area total
area total=12.5+40> 52.5 cm²

the answer part 1) is
52.5 cm²

Part 2) the polygon is a 3/4 of a circle and a square
area total=area of a 3/4 circle+area square

step 1
find the area of a 3/4 of circle
area of a 3/4 of circle=(3/4)*pi*r²
r=2 ft
area of a 3/4 of circle=(3/4)*pi*2²> 9.42 ft²

step 2
find the area of a square
area square=b²
b=2 ft
area square=2²> 4 ft²

step 3
find the area total
area total=9.42+4> 13.42 ft²

the answer Part 2) is
13.42 ft²

The first one is 2/3the second is 1/160the third is 4/125