Question

the parallelogram ABCD the area of triangle ABC is 10 square centimetre then the area of ABCD is equal to

Answer 1

since, ABCD is a //gm and AC is a diagonal
therefore, ar (triangle ABC)=ar (triangle ADC)
now,
Area of //gm ABCD=ar of triangleABC + ar of triangle ADC
=ar of triangle ABC + ar of triangle ABC
=10+10
20 cm^2