Question

Two adjacent sides of a parellegram measure 5cm and 3.5cm if one of its diagonal measure 6.5cm find the area of parellegram

Answer 1

Let us take case 5, 6.5 and 3.5 is the triangle.This is half the area of the parallelogram.  Area of triangle 2s= 5+6.5 +3.5= 15  s= 7.5  s-a=2.5  s-b=1  s-c=4  s(s-a)(s-b)(s-c)= 75  Area of triangle = root 75  Area of parallelogram= 2 root 75= 17.321cm^2