Question

in figure ABCD is a quadrilateral ABCD =1/2 BD (am + CL)where am and CN are perpendicular on diagonal BD

Answer 1

hey buddy!!    

Here is your answer;  

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ar ( ABCD ) = ar(triangle ABD) + ar(triangle BCD)

                   = 1/2*BD*AM + 1/2*BD*CL

                   = 1/2*BD(AM+CL) (hence proved)

➡hope this helps you deaR ✌✌✌.

Answer 2

ATTACHMENT............