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Find the measure of a base angle of a isosceles triangle if the measure of the vertex angle is 100
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Find the measure of a base angle of a isosceles triangle if the measure of the vertex angle is 100

User Eugen Labun
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Sum of the angles in a triangle ... 180!

Isosceles, two of them are equal: 100 + 2x =180, x = 40 degrees! <- That's the answer ;)
User Ambassallo
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