Question

please help i will mark as brainliest

Answer 1

Given, Radius (r) of the cone

=402=20cm=0.2 m

Height (h) of the cone =1 m

Slant height (l) of the cone

 =√h2+r2

=[√(1)2+(0.2)2]m=(√1.04)m=1.02 m

CSA of each cone  =πrl

=(3.14×0.2×1.02)m2=0.64056 m2

CSA of 50 such cones =(50×0.64056)m2

=32.028 m2

Cost of painting 1m2 area=₹ 12

Cost of painting 32.028 m2 area=₹(32.028×12)

=₹384.336

=₹384.34 (approximately)

Therefore, it will cost ₹384.34 to paint 50 such hollow cones.