Question

ABCD is a parallelogram , AE is perpendicular to DC and CF is perpendicular to AD.
If AB= 16cm AE= 8cm and CF = 10cm then AD = ?​

Answer 1

Answer:

it is not question of english

Explanation:

AB=CD=16cm

area of parallelogram=b×h

area of ABCD=CD×AE=AD×CF

16×8=AD×10

128=AD×10

12.8=AD

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Answer 2

Answer:

AD=12.8cm

Explanation:

Ar(llgram ABCD)with base DC and height AE=DC×AE →→→→→1

Ar(llgram ABCD)with base AD and height CF=AD×CF →→→→→2

From 1 and 2,

       DC×AE=AD×CF

 16cm×8cm=AD×10cm

         128cm=AD×10cm

128cm/10cm=AD

             ⇒AD=12.8cm

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