Classifying Angles and Triangles

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

How many degrees are in a full circle?

Back

There are 360 degrees in a full circle.

Front

What is a triangle?

Back

A triangle is a polygon with three sides and three angles.

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle that has all three sides of equal length.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length.

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle that has all sides of different lengths.

Front

How many acute angles does an acute triangle have?

Back

An acute triangle has three acute angles.