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Isosceles and Equilateral Triangles

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Finding the missing angle in an equilateral triangle

Finding the missing angle in an equilateral triangle

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Finding the missing angle in an equilateral triangle

1:03

About this lesson

Find x.

equilateral triangles and angles inside the triangles

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Video 1 of 5

Finding the missing angle in an equilateral triangle

1 min

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Solving for x using equilateral triangle side lengths

2 min

Solving for x in an equilateral triangle using equal sides

2 min

Finding unknown base angles in an isosceles triangle

2 min

Proving triangle DEF is isosceles using perpendicular bisector

4 min