Question

ABCD is a parallelogram
where DE is perpendicular
to AB. If BD = 17 cm, AE
15 cm, and area of triangle ADE
= 60 sq.cm, find the perimeter
of ABCD
​

Answer 1

Answer:

6.66cm

Step-by-step explanation:

In  parallelogram ABCD, we have given AB=10cm, AE=8cm, and CF=12cm.

⇒  AB=DC=10cm         [Opposite sides of parallelogram are equal]

⇒  Lets find out area of parallelogram with height AE and base DC.

⇒  Area of parallelogram ABCD=b×h

⇒  Area of parallelogram ABCD=DC×AE

⇒  10×8

∴   Area of parallelogram ABCD=80cm ^2  --- ( 1 )

⇒  Now, to find area of parallelogram let CF be the height and AD will be base.

⇒  Area of parallelogram ABCD=CF×AD

⇒  80=12×AD       [From ( 1 )]

⇒  AD=18/20  

​∴   AD=6.66cm

Answer 2

Step-by-step explanation:

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