Question

A triangular based have dimension 5 cm 12 cm and 13 cm find the cost of painting it at the rate of rupees

Answer 1

Semi perimeter of triangle s=

2

5+12+13

=15cm

Therfore,

Area of triangle⇒A=

s(s−a)(s−b)(s−c)

[By Herons formula]

=

15(15−5)(15−12)(15−13)

=

15×3×10×2

=

900

=30cm

2

Cost of painting =Rs.30 per sq. centimeter

Therefore,

Cost of paintin sheet =30×30=Rs.900

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