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Question

A triangular wall having sides 3m, 5m and 6m has to be painted. If the cost of painting 1m2 of wall is Rs 5. What is the cost of painting the whole wall?


A

16√3

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B

10√14

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C

14√10

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D

12√14

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Solution

The correct option is B

10√14


Using the Heron's formula, Area (A)= s(sa)(sb)(sc).

Semi-Perimeter (s) = a+b+c2

s = 7

Area = 7421 = 214

Hence the cost = 5A
Cost of the painting = Rs. 1014


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