Question

A metal trunk is 1.5 m long, 1.2 m broad and 1.3 m high. What is its total surface area?

Answer 1

Length (l) of the trunk = 1.5 m
Breadth (b) of the trunk = 1.2 m
Height (h) of the trunk = 1.3 m
Total surface area of the trunk = 2 (l × b + b × h + h × l)
= 2 (1.5 × 1.2 + 1.2 × 1.3 + 1.3 × 1.5) m²
= 2 (1.8 + 1.56 + 1.95) m²
= 2 (3.36 + 1.95) m²
= 2 (5.31) m²
= 10.62 m²
∴ Total surface area of the trunk is 10.62 m².