Question

figure calculate the area of parallelogram ABCD

Answer 1

Hey,

Area of parallelogram = base×height
=====================5×7=35cmsq.
so...
Area of parallelogram is 35cmsq.

Answer 2

s = 10cm
s-a = 10-8 = 2cm
s-b = 10-5 = 5cm
s-c = 10-7 = 3cm

Area of Triangle by Heron's Formula = $\sqrt{s(s-a)(s-b)(s-c)}$
Area = $\sqrt{10*2*5*3}$
Area = $\sqrt{300}$
Area = 17.32$cm^{2}$

Area of Parallelogram = 2 times Area of Triangle
Area of Parallelogram = 2*17.32 = 34.641$cm^{2}$