A regular right pyramid has a square base of side 8 cm and a height of 3 cm. Find its total surface area.
Show answer & explanation
Correct answer: B
Explanation
Base side = 8 cm, height = 3 cm
according to formula
Total surface area = base area + side area
l = √(3² + 4²) = 5
Lateral area = 4 × (1/2 × 8 × 5) = 80
Base area = 8² = 64
Total surface area = 80 + 64 = 144 cm²