Classifying Triangles by Sides and Angles

Front

What is an isosceles triangle?

Back

An isosceles triangle has two sides that are equal in length and two angles that are equal.

Front

What is an equilateral triangle?

Back

An equilateral triangle has all three sides equal in length and all three angles equal, each measuring 60 degrees.

Front

What is a scalene triangle?

Back

A scalene triangle has all sides of different lengths and all angles of different measures.

Front

What is an acute triangle?

Back

An acute triangle is a triangle where all three angles are less than 90 degrees.

Front

What is a right triangle?

Back

A right triangle has one angle that measures exactly 90 degrees.

Front

What is an obtuse triangle?

Back

An obtuse triangle has one angle that is greater than 90 degrees.

Front

What do the lines (sticks) on a triangle mean?

Back

The lines (sticks) show that the sides they touch are equal in length.

Front

True or False: An acute triangle has 3 acute angles.

Back

True

Front

True or False: A right, isosceles triangle has 1 right angle and 2 equal sides.

Back

True

Front

How many sides does a triangle have?

Back

A triangle has 3 sides.