7th grade geometry/angles review

An angle is formed by two rays (sides of the angle) that share a common endpoint (the vertex).

The different types of angles are acute (less than 90°), right (exactly 90°), obtuse (greater than 90° but less than 180°), straight (exactly 180°), and reflex (greater than 180°).

The sum of the angles in a triangle is always 180 degrees. To find a missing angle, subtract the sum of the known angles from 180 degrees.

Complementary angles are two angles whose sum is 90 degrees.

Supplementary angles are two angles whose sum is 180 degrees.

Subtract 65 from both sides to get 5x = 25, then divide by 5 to find x = 5.

The angle formed is obtuse.

The measure of an exterior angle is equal to the sum of the two opposite interior angles.

The angle can be calculated using the formula: |(30*hour - (11/2)*minutes)|.

Vertical angles are equal; when two lines intersect, the opposite angles formed are congruent.