Geometry Unit 2 Test

Angle

Formed by two rays with a common endpoint called the vertex; measured in degrees (°)

Vertex

The common endpoint of two rays that form an angle.

Opposite ray

Two rays that share the same endpoint and form a straight line (180°).

Adjacent Angles

Two angles that share a side and a vertex but do not overlap.

Acute Angle

An angle that measures between 0° and 90°.

Right Angle

An angle that measures exactly 90°.

Obtuse Angle

An angle that measures between 90° and 180°.

Straight Angle

An angle that measures exactly 180°.

Complementary Angles

Two angles whose measures add up to 90°.

Supplementary Angles

Two angles whose measures add up to 180°.

Linear Pair

A pair of adjacent angles whose non-common sides form a straight line; their sum is 180°.

Vertical Angles

Opposite angles formed by two intersecting lines; always congruent.

Perpendicular Angles

Two lines, segments, or rays that intersect to form a 90° angle. (Upside down T symbol)

Defintion

A statement accepted as true that explains a concept.

Theorem

A statement that can be proved true using logic, definitions, and facts.