In a parallelogram ABCD,DF is perpendicular to AB and BE is perpendicular to AB. AB=30 cm and DF=6 cm.if AD=20 cm then BE=?
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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=80cm2 --- ( 1 )
⇒ Now, to find area of parallelogram let CFbe the height and AD will be base.
⇒ Area of parallelogram ABCD=CF×AD
⇒ 80=12×AD [From ( 1 )]
⇒ AD=1280
∴ AD=6.66cm
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this is very easy trick
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