Question

The measure of the vertex angel of an isosceles triangle is 50. Find the measure of a base angel of the triangle

Answer 1

let the unknown angle be x

50+x+x=180(angle some property of an triangle)

2x=180-50

2x=130

x=130/2

x=65

Answer 2

The vertex angle measures 50°

In an isosceles triangle the base angles are equal

Therefore,

Base angle + base angle + vertex angle = 180°

2× base angle + 50° = 180°

base angle = (180°-50°)/2

therefore,

base angle = 65°

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