A triangular signboard has sides 12 cm, 16 cm and 20 cm.
It is to be painted on both faces.
Find the total area to be painted (in $cm^{2}$ ).

Question

A triangular signboard has sides 12 cm, 16 cm and 20 cm. It is to be painted on both faces. Find the total area to be painted (in cm^2).

Accepted Answer

192. s = 12+16+20/2 = 24. Area = √24 · 12 · 8 · 4 = √9216 = 96 cm^2 per face. Both faces: 2 · 96 = 192 cm^2.

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