Rectangle:
A = lw
A = 10(4)
A = 40in^2
Triangle 1 and 2:
A = 1/2bh
A = 1/2(3)(4)
A = 1/2(12)
A = 6 in^2
Semicircle:
r = d/2
r = 10/2
r = 5 in
A = πr²/2
A = π(5)^2/2
A = π(25)/2
A = 78.5/2
A = 39.25 in^2
Total:
A = 40in^2 + 6in^2 + 6in^2 + 39.25in^2
A = 91.25in^2
