Lines, Angles, and Triangles

Front

What are parallel lines?

Back

Lines that never meet and are always the same distance apart.

Front

What is an acute triangle?

Back

A triangle where all three angles are less than 90 degrees.

Front

What is a right triangle?

Back

A triangle that has one angle equal to 90 degrees.

Front

What is an obtuse triangle?

Back

A triangle that has one angle greater than 90 degrees.

Front

What are intersecting lines?

Back

Lines that cross each other at one point.

Front

What are perpendicular lines?

Back

Lines that intersect to form a right angle (90 degrees).

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

What is a transversal line?

Back

A line that crosses two or more other lines.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect.

Front

What are complementary angles?

Back

Two angles that add up to 90 degrees.