Answer:
Total surface area = 1044 yd²
Step-by-step explanation:
From the figure we can see a square pyramid.
Base = 18 yd
Slant height = 20 yd
To find the Base area
Total surface area = Base area + (4* area of one lateral face)
Base area = Base² = 18² = 324 yd²
To find the lateral surface area
Area of one face = bh/2
b = base = 18 yd
h = Slant height = 20 yd
Area = bh/2 = (18 * 20)/2 = 180 yd²
Lateral surface area = 4 * 180 = 720 yd²
To find the total surface area
Total surface area = 324 + 720 = 1044 yd²
