1.

A wooden cone is has radius 30cm and height 40cm. Find its slant height. Calculate the cost to paint the face of 10 such cones at the rate of Rs.50/- per square metre.

Answer»

Base Radius = 30 cm

Height = 40 cm

Slant height = \(\sqrt{40^2+30^2}\) = 50

Surface area of the cone = πr2 + πrl = π × 302 + π × 30 × 50

= 900π + 1500π = 2400π

Total cost to paint 10 cones = \(\frac{2400\pi \times10\times50}{10000}\)

\(\frac{2400\times3.14\times10\times50}{10000}\) = 377Rs



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