Retake Chapter 3 Parallel lines and angles in Polygons

Front

What are parallel lines?

Back

Parallel lines are lines in a plane that never meet. They are always the same distance apart and have the same slope.

Front

What is the sum of the interior angles of a polygon with n sides?

Back

The sum of the interior angles of a polygon with n sides is (n - 2) × 180°.

Front

What is the measure of each interior angle of a regular polygon with n sides?

Back

Each interior angle of a regular polygon with n sides is ((n - 2) × 180°) / n.

Front

What is an exterior angle of a polygon?

Back

An exterior angle of a polygon is formed by one side of the polygon and the extension of an adjacent side.

Front

What is the relationship between interior and exterior angles of a polygon?

Back

The interior angle and the exterior angle at each vertex of a polygon are supplementary, meaning they add up to 180°.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal.

Front

What are corresponding angles?

Back

Corresponding angles are angles that are in the same position at each intersection where a straight line crosses two others. They are equal when the lines are parallel.

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles on opposite sides of a transversal but inside the two lines. They are equal when the lines are parallel.

Front

What is the measure of each exterior angle of a regular hexagon?

Back

Each exterior angle of a regular hexagon is 60°.

Front

How do you solve for x in the equation 7x + 19 = -2x + 55?

Back

Combine like terms: 9x = 36, so x = 4.