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In the figure at the right,

In The Figure At The Right class=

Sagot :

Check the picture below.

[tex]\boxed{4a}\\\\ \triangle BCD \sim \triangle \textit{D} EF\qquad \textit{similarity by AA} \\\\\\ \boxed{4b}\\\\ \triangle ACE \sim \triangle ABF\qquad \textit{similarity by AA}[/tex]

notice on 4b, they both share the angle at A, and congruent angles at C and F.

View image jdoe0001