51
In $\triangle ABC$ and $\triangle DEF$, $\frac{AB}{DE} = \frac{BC}{FD}$. Which of the following makes the two triangles similar?
- (a)$\angle A = \angle D$
- (b)$\angle B = \angle D$
- (c)$\angle B = \angle E$
- (d)$\angle A = \angle F$
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(b) $\angle B = \angle D$