Interior and Exterior Angles of Triangles

Front

What is an exterior angle of a triangle?

Back

An exterior angle of a triangle is formed by one side of the triangle and the extension of an adjacent side. It is equal to the sum of the two remote interior angles.

Front

What are remote interior angles?

Back

Remote interior angles are the two angles inside a triangle that are not adjacent to a given exterior angle.

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

What is the relationship between an exterior angle and its remote interior angles?

Back

The exterior angle is equal to the sum of its two remote interior angles.

Front

Define corresponding angles in the context of parallel lines and a transversal.

Back

Corresponding angles are pairs of angles that are in similar positions at each intersection where a straight line crosses two others (parallel lines). They are equal in measure.

Front

What is a transformation in geometry?

Back

A transformation is an operation that moves or changes a shape in some way to produce a new shape.

Front

What are the three main types of transformations?

Back

The three main types of transformations are translation (sliding), reflection (flipping), and rotation (turning).

Front

What is a translation?

Back

A translation moves every point of a shape the same distance in the same direction.

Front

What is a reflection?

Back

A reflection flips a shape over a line, creating a mirror image.

Front

What is a rotation?

Back

A rotation turns a shape around a fixed point, called the center of rotation, by a certain angle.