# Math Vocab

## Straight Angles

Angles which measure exactly 180° (degrees) are straight angles. Therefore, straight angles are straight lines. Angles are represented by the sign ϴ, called theta. That is, for straight angles, ϴ= 180°.

## Right Angles

Angles that are exactly at 90°

## Obtuse Angles

Angles that are more than 90° but less than 180°

## Reflex Angles

Angles that are more than 180° but less than 360°

Angles that share the same vertex, and have a common side

## Complementary Angles

When two angles add up to 90°

## Supplementary Angles

When two angles add up to 180°

## Vertically Opposite Angles

Vertically opposite angles are the angles opposite to each other when two straight lines intersect. Their defining property is that, vertically opposite angles are equal in magnitude.

## Corresponding Angles

When two parallel lines are crossed by a line called the transversal, the angles formed which are in corresponding positions, are called corresponding angles. Corresponding angles are equal in magnitude.