Lines and Angles in Shapes

Front

What is an obtuse triangle?

Back

A triangle with one angle larger than 90 degrees.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

What are parallel lines?

Back

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

Front

What is a triangle?

Back

A polygon with three sides and three angles.

Front

What is a quadrilateral?

Back

A polygon with four sides and four angles.

Front

What is a right triangle?

Back

A triangle that has one right angle.

Front

What is the sum of angles in a triangle?

Back

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

Front

What is an acute triangle?

Back

A triangle with all three angles measuring less than 90 degrees.