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They are called supplementary angles.

Q: What is the Sum of an exterior angle of a triangle and its adjacent interior angle is called?

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Such is called an exterior angle. A useful theorem is that an exterior angle is equal to the sum of its non adjacent interior angles.

The side that is not adjacent to another side of a triangle is called the opposite side.

The side of the triangle next to the angle is called the adjacent side.

adjacent, opposite and hypotenuse

A polygon can only have sides. There are no interior or exterior sides: all sides are the boundaries of a polygon. They could be called equilateral although that names seems to be reserved for triangles.

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Such is called an exterior angle. A useful theorem is that an exterior angle is equal to the sum of its non adjacent interior angles.

Exterior Angle Theorem Exterior angle of a triangle An exterior angle of a triangle is the angle formed by a side of the triangle and the extension of an adjacent side. In other words, it is the angle that is formed when you extend one of the sides of the triangle to create a new line, and then measure the angle between that new line and the adjacent side of the original triangle. Each triangle has three exterior angles, one at each vertex of the triangle. The measure of each exterior angle is equal to the sum of the measures of the two interior angles that are not adjacent to it. This is known as the Exterior Angle Theorem. For example, in the triangle below, the exterior angle at vertex C is equal to the sum of the measures of angles A and B So, angle ACB (the exterior angle at vertex C) is equal to the sum of angles A and B. Recomended for you: 𝕨𝕨𝕨.𝕕𝕚𝕘𝕚𝕤𝕥𝕠𝕣𝕖𝟚𝟜.𝕔𝕠𝕞/𝕣𝕖𝕕𝕚𝕣/𝟛𝟚𝟝𝟞𝟝𝟠/ℂ𝕠𝕝𝕝𝕖𝕟ℂ𝕠𝕒𝕝/

In a polygon there are no such angles.

The side that is not adjacent to another side of a triangle is called the opposite side.

A triangle with a 90o interior angle is called a 'right' triangle. BTW, any triangle can have only one 90o interior angle

The side of the triangle next to the angle is called the adjacent side.

A possibility is the interior and exterior vertex angles add up to 180 degrees which are supplementary angles * * * * * On the basis of the information given in the question, they are simply adjacent angles.

opposite and adjacent

adjacent, opposite and hypotenuse

Both alternate interior and alternate exterior angle pairs lie on opposite sides of the transversal.

The study of Earth's interior is called geology.

exterior angles