Question

A bus stop is barricaded from the remaining part of the road, by using 50 hollow cones made of recycled cardboard. Each cone has a base diameter of 40 cm and height 1 m. If the outer side of each of the cones is to be painted and the cost of painting is f 12 per m2, what will be the cost of painting ail the cones?​

Answer 1

Given:-

No. of Cones = 50

Diameter = 40 cm = 0.4 m

Radius = 0.2 m

Height = 1 m

step-by-step explaination:-

Radius of the cone (r) = 40/2 cm = 20 cm = 0.2 m

Height of the cone (h) = 1 m

• Let l  be the slant height of a cone.

∴ l = √h² + r²

⇒ l = √12 + 0.22 

⇒ l = √1.04 

⇒ l = 1.02 m

Rate of painting = ₹12 per m²

Curved surface of 1 cone = πrl m²

                                         = (3.14 × 0.2 × 1.02) m²

                                         = 0.64056 m²

Curved surface of such 50 cones

= (50 × 0.64056) m²

 = 32.028 m²

Cost of painting all these cones

= ₹(32.028 × 12)

= ₹384.34

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hope it helps buddy : )

Answer 2

Answer:

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