Question

Triangle Abc is a issosceles triangle with AB=Ac .If angle A = 100° and angle ecd = 40° then prove that ab parallel to ce

Answer 1

Answer: Corresponding Angles

If triangle ABC is isoceles and AB = AC.

Angle A = 100°

Therefore, Angle B and C = 40°

According to question BC is extended till D

And, Angle ECD = 40°

Angle ECD and Angle ABC are corresponding angles

As these two angles are equal, using property of equal corresponding angles in Parallel lines.

We can declare AB and EC parallel

Answer 2

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