Q. 115.0( 2 Votes )

A boy is designin

Answer :

To find DB

Let EAD = x ----(1)


ADE = 90 – x ( AED = 90 and sum of angles of triangle is 180)


EDC = x ( ADC = 90) ----(2)


EAD = EDC (by (1) and (2)) ----(3)


Now,


In ΔAED and ΔDEC


AED = DEC (both perpendicular to AC)


EAD = EDC (by (3))


ΔAED ΔDEC


( ΔAED ΔDEC)


16×81 = ED2


ED = 36 cm


2×ED = DB = 72 cm


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