Question

ABCD is a parallelogram AE is perpendicular to DC if DC is equal to 20 cm AD is equal to 5 cm an the area of the parallelogram is 40 cm square find DE

Answer 1

thanks for asking.

THE answer is in the picture

Answer 2

Answer:

√21

Step-by-step explanation:

Area = 20 ×AE

AE=40/20

=2 cm

So;in∆ADE :AD = 5cm

AE = 2cm

So , according to Pythagoras Theory=AD sq.=AE sq.+DE sq.

=(5×5) =(2×2)+DE sq.

=25=4+DE sq.

=25-4=DE sq.

=21=DE sq.

=√21cm=DE