Q. 194.5( 4 Votes )

# The radii o

Answer :

Given: Radius of lower circular end = r = 12 cm

Radius of upper circular end = R = 18 cm

Height of frustum = h = 8 cm

Formula: Total surface area of frustum = πr2 + πR2 + π(R + r)l cm2

Where l = slant height

For slant height we have  l = 10 cm

total surface area of frustum = π × 122 + π × 182 + π × (18 + 12) × 10 cm2

= 3.14 × (144 + 324 + 300) cm2

= 3.14 × 768 cm2

= 2411.52 cm2

total surface area of frustum = 2411.52 cm2

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