Why does the interior angle measures of a triangle equal 180 degrees?

Why do the angles in a triangle add up to 180°??

Proof of the Sum of Angles of a Triangle Measure 180 Degrees | Don't Memorise

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The Sum of the Interior Angles in a Triangle are 180° Demonstration

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Geometry: Sum of the angles in a triangle (a one-minute proof)

One of the equal angles of an isosceles triangle is 50°. find all the angles of this triangle.

Angles in Equilateral Triangle

"The three angles of a triangle are equal to one another. What is the measure

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Interior and Exterior Angles of a Triangle

Proof: The Sum of the Interior Angles of a Triangle is Equal to 180 degrees