The diameter of a right circular cone is 14 m and its slant height is 12 m. Find the cost of colouring its total surface at the rate of 14 paise per sq. M.
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Answer:
85.56 per sq m
Explanation:
given,
diameter of a cone =14m
radius of a cone= 14÷2
=7m
slant height=12m
we need height to find TSA.
so,
h= root of l square+r square
h= root 7^2+12^2
=root 49+144
=13.89
TSA of cone = 2 pi rh
= 2×22÷7×7×13.89
=44×13.89
=611.16m^2
cost of colouring TSA
=611.16×14÷100
=85.56 per sq m
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