Question

If in two triangle ABC and DEF, ∠A = ∠E, ∠B = ∠F, then which of the following is not true?

(a) $\frac{\mathrm{BC}}{\mathrm{DF}}=\frac{\mathrm{AC}}{\mathrm{DE}}$
(b) $\frac{\mathrm{AB}}{\mathrm{DE}}=\frac{\mathrm{BC}}{\mathrm{DF}}$
(c) $\frac{\mathrm{AB}}{\mathrm{EF}}=\frac{\mathrm{AC}}{\mathrm{DE}}$
(d) $\frac{\mathrm{BC}}{\mathrm{DF}}=\frac{\mathrm{AB}}{\mathrm{EF}}$

Answer 1

In ΔABC and ΔDEF

∴ ΔABC and ΔDEF are similar triangles.

Hence

Hence the correct answer is (b).