In the adjoining figure, MNPQ and ABPQ are parallelograms and T is any point on the side BP. Prove that
In the adjoining figure, MNPQ and ABPQ are parallelograms and T is any point on the side BP. Prove that
(i) ar(MNPQ) = are(ABPQ)
(ii) $\operatorname{ar}(\triangle A T Q)=\frac{1}{2} \operatorname{ar}(M N P Q)$.
(i) We know that parallelograms on the same base and between the same parallels are equal in area.
So, ar(MNPQ) = are(ABPQ) (Same base PQ and MB || PQ) .....(1)
(ii) If a parallelogram and a triangle are on the same base and between the same parallels then the area of the triangle is equal to half the area of the parallelogram.
So, $\operatorname{ar}(\Delta A T Q)=\frac{1}{2} \operatorname{ar}(A B P Q)$ (Same base $A Q$ and $A Q \| B P$ ) .....(2)
From (1) and (2)
$\operatorname{ar}(\Delta A T Q)=\frac{1}{2} \operatorname{ar}(M N P Q)$
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