Alternate Interior Angles

Real Example

The pairs of angles on opposite sides of the transversal but inside the two lines are called Alternate Interior Angles.

Example

Transversal

a line intersecting two or more other lines

Same-Side Exterior Angles

Exterior Angles are created where a transversal crosses two (usually parallel) lines. Each pair of these angles are outside the parallel lines, and on the same side of the transversal.

Example

Real example

Equiangular Triangle

equilateral triangle: a three-sided regular polygon

Scalene Triangle

a triangle with no two sides of equal length

Isosceles Triangle

a triangle with two equal sides.

Legs (of a right triangle)

In a right triangle, the sides opposite to the acute angles are called the Legs of a Triangle.