Question

ABCD is a parallelogram in which AB = 20cm, BC = 13cm, AC = 21cm. Find the perimeter of parallelogram ABCD.

Answer 1

*Main Answer:-

• 252 cm²

Step by step explanation:-

In parallelogram ABCD ,

• AB = 20cm,
• BC = 13cm
• AC = 21cm.

To find area(parallelogram ABCD) , firstly find the area of triangle ABC. Then we double it.

Area(triangleABC)

• = √{s(s-a)(s-b)(s-c)} ,

where s is the semi perimeter of thetriangle. And a, b, c are its sides.

Area(triangle ABC)

• = √{27 × 7 × 14 × 6}

• => area = √{3² × 3² × 2² × 7²}

• => area = 126 cm²

So, area( parallelogram)

• = 126 × 2 = 252cm²

$hope \: it \: helps \: you$