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1. The area of a triangle whose sides are of lengths 3 cm, 4 cm and 5 cm is :

A. 8 cm²

B. 6 cm²

C. 10 cm²

D. None of these

Solution:

Since 3² + 4² = 5²,
So it is a right-angled triangle with Base = 3 cm and Height = 4 cm
∴ Area :

\begin{aligned} = (\frac{1}{2} \times 3 \times 4) c m^{2} \\ = 6 c m^{2} \end{aligned}

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