Question #ef39a

1 Answer
CW
Jan 28, 2018

see explanation.

Explanation:

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Let #angleBAC=x, and angleBCA=y#, as shown in the figure.
#=> x+y+90=180^@, => x+y=90^@#
In #DeltaABD, angleABD=90-x=y#,
#=> angleCBD=90-y=x#
The three corresponding angles of #DeltaADB and DeltaBDC# are equal, #=> DeltaADB and DeltaBDC# are similar.

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