Given height of frustum = h =6 cm

Radius of top = r = 6 cm

Radius of bottom = R = 14 cm

Let the slant height of the frustum be ‘ℓ’ cm

We know in frustum

(Slant height)2 = (height)2 + (R – r)2eqn1

2 = 62 + (14 – 6)2 (putting values of r, R and h in eqn1)

2 = 36 + 82

2 = 36 + 64

2 = 100

ℓ = √100

ℓ = 10 cm

Slant height of the frustum is 10 cm.

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