Question

The circumferences of circular faces of a frustum are 132 cm and 88 cm and its height is 24 cm. To find the curved surface area of frustum, complete the following activity. (π = 22/7)

Answer 1

Circumference1 = 27πr₁ = 132 cm

Curved surface area of frustum = π (r₁ + r₂ ) l 

= π (21 + 14) × 25 

=π × 35 × 35 

= 22/7 × 35 × 25 

= 2750 cm²