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Math Dictionary

Definitions for Angles

Definitions for 2-D Shapes/Geometry
Definitions for Angles
Definitions for Circles
Definitions for Fractions/Decimals
Definitions for Integers
Definitions for Units of Measurement

Angles: an angle is the rate of spread or distance between two lines, which are connected at one point. Angles are measures in radians, degrees, and gradients.

Alternate angles: Alternate angles are two angles that form a Z-like shape. Alternate angles are formed when a line crosses two parallel lines on a slant. The 2 acute angles at where the slanted line crosses both parallel lines are equal, and called alternate angles.

Co-interior angles: Co-interior angles are two angles on the same side of a 'C' like shape which can be slanted. The sum of two co-interior angles is always 180.

Complimentary angles:Complimentary angles are two or more angles which are equivelent to exactly 90.

Supplementary angles: Supplementary angles are two or more angles which are equivelent to exactly 180.

Corresponding angles: Corresponding angles are two angles that form an 'F' like shape. Corresponding angles are created when a line crosses two parallel lines. The angles which are the same are the 2 obtuse angles. You can see a diagram of Corresponding angles at the bottom of this page.

Opposite angles: Opposite angles are two angles that share a vertex. Opposite angles are always equal, and are formed when two straight lines intersect.The angle striaght across from an angle is the same size as that angle.

Reflex angle: A reflex angle is an angle that is larger than 180.

Right angle: A right angle is an angle of exactly 90.

Straight angle: A straight angles is an angle of exactly 180.

Acute angle: an acute angle is an angle which is smaller than 90.

Obtuse angle: An obtuse angle is an angle that is smaller than 180, but larger than 90.

Corresponding Angles