Answer:
78.75 ft^2
Step-by-step explanation:
right triangle area
(6 X 20) ÷ 2 = 60 ft^2
left triangle area
do Pythagoras with 6 and 15:
√(15^2 - 6^2) ≈ 13.75
20 - 13.75 = 6.25
(6 X 6.25) ÷ 2 = 18.75 ft^2
total = 60 + 18.75
