Question

One angle of an isosceles traingle measure 120degree. Is it one of the equal angles or unequal angle?Why? Find the measure of other two angles.
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Answer 1

Answer:

No its not one of the equal angles because sum of all angles of a triangle is 180°. If 120° is one of the equal angles than 120° + 120° = 240°, which is greater than 180°.

Let the two equal anles be x.

•°• x + x + 120° = 180°

2x + 120° = 180°

2x = 180° - 120° = 60°

x = 60°/2 = 30°

So, the other angles are 30° and 30°

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