Q7 of 69 Page 9

State exterior angle theorem.

If a side of a triangle is produced, the exterior angle so formed is equal to the sum of the two interior opposite angles.


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If the angles A, B and C of Δ ABC satisfy the relation B – A = C – B, then find the measure of ∠B.

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In Δ ABC, if bisectors of ∠ABC and ∠ACB intersect at O angle of 120°, then find the measure of ∠A.

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If the side BC of Δ ABC is produced on both sides, then write the difference between the sum of the exterior angles so formed and ∠A.

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In a triangle ABC, if AB = AC and AB is produced to D such that BD = BC, find ∠ACD: ∠ADC.