Question

Find the area of each of the following triangles.

• A. (i) $20c{m}^2$ (ii) $12c{m}^2$ (iii) $20.25c{m}^2$ (iv) $12cm$.
• B. (i) $2c{m}^2$ (ii) $12c{m}^2$ (iii) $20.25c{m}^2$ (iv) $12cm$.
• C. (i) $20c{m}^2$ (ii) $1c{m}^2$ (iii) $20.25c{m}^2$ (iv) $12cm$.
• D. None of these

Answer 1

The correct option is A (i) $20c{m}^2$ (ii) $12c{m}^2$ (iii) $20.25c{m}^2$ (iv) $12cm$.

All the given figures are of triangle.

So area of a triangle is given by $\frac{1}{2}\times base\times height$.

$\left(i\right)$ Area=$\frac{1}{2}\times base\times height=\frac{1}{2}\times 5\times 8=20c{m}^2$

$\left(ii\right)$ Area=$\frac{1}{2}\times base\times height=\frac{1}{2}\times 6\times 4=12c{m}^2$

$\left(iii\right)$ Area=$\frac{1}{2}\times base\times height=\frac{1}{2}\times 7.5\times 5.4=20.25c{m}^2$

$\left(iv\right)$ Area=$\frac{1}{2}\times base\times height=\frac{1}{2}\times 6\times 4=12c{m}^2$.