Question

calculate the area of parallelogram whose adjacent sides are 20cm ,37cm,and the diognal is 51 cm.

Answer 1

very easy! multiply 20, 37 and 51 =37740 CM square

Answer 2

area of half of the parallelogram => triangle
dimensions => 20cm, 37cm and 51cm
and semi perimeter = 20+37+51/2=>108/2=54
so area =
$\sqrt{54(54 - 20)(54 - 37)(54 - 51)}$
$\sqrt{54 \times 34 \times 17 \times 3}$
$= > 306cm2$
therefore area of the parallelogram=>
=> 2*306 => 612 cm2