Answers

2015-09-04T19:02:13+05:30
Angle a=angle b=angle c =x. Sum of angles in a triangle is 180°. a +b+c=180° x+x+x=180° 3x=180° X=180°/3 X=60° Therefore angles are 60°,60°and60°
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2015-09-05T10:44:28+05:30
Given     :- In ΔABC,
                ∠A = ∠B = ∠C
To prove :- ΔABC is an equilateral triangle.

Proof      :- In ΔABC,
                 ∵ ∠A = ∠B → (given)
                 ∴ BC = AC → 1 (sides opp. to equal angles are equal)
                 
                     Similarly,
                     AB = BC → 2
              and  AC = AB → 3

                     From 1,2 & 3,
                    AB = BC = AC

                   ∵ All the three sides in triangle are equal.
                   ∴ ΔABC is an equilateral triangle.
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