Answer:
10.
A = 12² - 2(6×5)
A = 144 - 2×30
A = 144 - 60
A = 84 in²
11.
A = π(12/2)² - (π3² + 3×6)
A = π36 - (π9 + 18)
A = π36 - (π3² + 18)
A = 113.04 - (28.26 + 18)
A = 66.8 yd²
12.
A = 9² - (10×2 + π3²)
A = 81 - (20 + 28.26)
A = 81 - 48.26
A = 32.7 m²
