Answer:
The correct option is D
D) 340 inch²
Explanation:
The base of the pyramid is a square with side 10 inch
Area of square base = Length · Width = 10 · 10
Area of square base = 100 inch²
Height of triangle = 12 inches
Base of triangle = 10 inches
Area of triangle = (1/2)(Height)(Base) = (1/2)(12)(10)
Area of triangle = 60 inch²
Total number of triangles in a pyramid = 4
Total Area of 4 triangles = 4 · 60 inch²
Total Area of 4 triangles = 240 inch²
Surface Area = Area of 4 triangle + Area of the square base
Surface Area = 240 inch² + 100 inch²
Surface Area = 340 inch²