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4 Two angles of a triangle are 128° and 26°.
Explain why the triangle must be isoceles
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Given,the two angles are 128° and 26°
And also given it's a triangle
we know that, sum of 3 sides in a triangle = 180°
So 128 + 26 + third angle = 180°
154 + third angle = 180°
third angle = 180°-154°
third angle = 26°
So the three angles are 128,26,26
Isosceles triangle - Either two sides or angles of a triangle are same
Here, 26 and 26 are same
So hence it's a isosceles triangle
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