Question

find the area of parallelogram whose one diagonal is 6.8 cm and the perpendicular distance from the opposite

Answer 1

the area will be 2 ×product of diagonal and the corresponding height

Answer 2

The area of parallelogram whose diagonal is 6.8 cm and perpendicular distance of this diagonal from an opposite vertex is 7.5 cm is ?
we know diagonal divide parallelogram in to two congruent triangle and area of congruent triangle are equal
in other word we can say diagonal decide parallelogram in two equal are triangle 
area of triangle =1/2 basex height 
=1/2 x6.8x7.5 square cm 
area of parallelogram will be equal to area of two triangle 
area of parallelogram =2x1/2x6.8x7.5= 6.8x7.5 =51.00 square cm 
Answer 51.00 square cm