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Δ ABC is isosceles with AB = AC. AD is the altitude from A on BC.(i) Is ΔABD ≅ ΔACD?(ii) State the pairs of matching parts you have used to answer (i).(iii) Is it true to say that BD = DC? |
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Answer» (i) Yes, ΔABD ≅ ΔACD by RHS congruence condition. (ii) We have used Hypotenuse AB = Hypotenuse AC AD = DA ∠ADB = ∠ADC = 90° (AD ⊥ BC at point D) (iii) Yes, it is true to say that BD = DC (corresponding parts of congruent triangles) Since we have already proved that the two triangles are congruent. |
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