Question

13) Find the area of rectangular field whose length is 80m and perimeter is 240m.
OR
Find the area of quadrilateral PQRS shown in fig QS -5.5em.
R​

Answer 1

$\sf \Large Solution!!$

$\sf \to Length=80\:m$

$\sf \to Perimeter=240\:m$

$\sf \to Perimeter=2(Length+Breadth)$

$\sf \to 240=2(80+Breadth)$

$\sf \to \dfrac{240}{2}=80+Breadth$

$\sf \to 120=80+Breadth$

$\sf \to Breadth=120-80$

$\sf \to Breadth=40\:m$

$\sf \large Now,$

$\sf \to Area=Length\times Breadth$

$\sf \to Area=80\:m\times 40\:m$

$\sf \to Area=3200\:m^{2}$