Question

Area of triangle PQR is $$100\, cm^2$$ (Fig ). If altitude QT is $$10\, cm$$, then its base PR is.

Answer 1

Correct option is A. $$ 20 \,cm$$
Option (a) is correct.
Give, area of triangle $$PQR =100\, cm^2$$.

We know drat Area of triangle $$PQR \times \dfrac {1}{2} PR \times QT$$

$$ \Rightarrow 100 = \dfrac {1}{2} \times PR \times 10$$

$$ \Rightarrow PR =\dfrac {100\times 2}{10}$$

$$ \Rightarrow PR = 20\, cm$$