Answer:
Part 1) The area of the structure is

Part 2) The slab will contain
of cement
Explanation:
Part 1) Find the area of the structure
we know that
The area of the structure is equal to the area of rectangle plus the area of semicircle
Find the area of rectangle
The area of rectangle is equal to

we have


substitute


Find the area of semicircle
The area of semicircle is

we have


substitute


Find the area of the structure
Adds the areas

Part 2) If the structure is 6 in thick, how many cubic feet of cement will the slab contain?
Remember that

Convert inches to feet

Find the volume of the structure
To obtain the volume , multiply the area by 0.5 ft (thick)
so
