Question
A triangular wall having sides 3 m, 5 m and 6 m has to be painted. If the cost of painting 1 m2 of a wall is ₹ 5, what is the cost of painting the whole wall?
Answer: Option B
:
B
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B
Semi perimeter of a triangle = (a+b+c)2 ⇒ (3+5+6)2=7m
Area of a triangle = √s(s−a)(s−b)(s−c) ⇒ √7(7−3)(7−5)(7−6)
⇒ √7×4×2×1
⇒ √14×4
⇒√56=2√14 m2
Since,cost of painting 1 m2 of wall is ₹5,
The cost of painting the whole wall =5×2√14=₹ 10√14.
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