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The Exterior Angle property of a Triangle

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This demonstrates that an exterior angle in a triangle is always equal to the sum of the two interior opposite angles.

Theorem 06 - The Exterior Angle of a Triangle

Drag the points to change the shape of the triangle. Although the angles change size, the exterior angle is always equal to the sum of the two interior opposite angles.

What is the exterior angle of a Isoceles Right Triangle?

What is the exterior angle of an equilateral Triangle?