Classifying Triangles

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 type of triangle has all sides of different lengths?

Back

A scalene triangle.

Front

What type of triangle has two sides of equal length?

Back

An isosceles triangle.

Front

What type of triangle has all sides of equal length?

Back

An equilateral triangle.

Front

What is an acute triangle?

Back

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

Front

Can an acute triangle be equilateral?

Back

Yes, an equilateral triangle is also an acute triangle.

Front

What is a right triangle?

Back

A right triangle is a triangle that has one angle measuring exactly 90 degrees.

Front

What is the sum of the angles in any triangle?

Back

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

Front

If one angle in a triangle is obtuse, what can be said about the other two angles?

Back

The other two angles must be acute, as the sum of all angles must equal 180 degrees.

Front

What is the definition of a triangle?

Back

A triangle is a polygon with three edges and three vertices.