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2014-08-30T05:03:48+05:30

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Unless there is a trick, it is simple appication of heron's law for calculating area of triangle and multiply with 16.  If we know how they are arranged, may be we can simplify our calculations.

 Semi\ perimeter\ =\ s\ =\ (\frac{9+28+35}{2} = 36 \\ \\ Area\ =\ \sqrt{s (s-a)(s-b)(s-c)} = \sqrt{36*27*8*1} = 88.18 cm² \\ \\ cost\ =\ 16\ *\ area\ *\ Rs\ 0.50\ =\ Rs\ 705.45 \\ \\

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