Classifying Triangles

Front

What is a triangle?

Back

A triangle is a three-sided polygon.

Front

What are the types of triangles based on sides?

Back

1. Equilateral: All sides are equal. 2. Isosceles: Two sides are equal. 3. Scalene: All sides are different.

Front

What are the types of triangles based on angles?

Back

1. Acute: All angles are less than 90 degrees. 2. Right: One angle is exactly 90 degrees. 3. Obtuse: One angle is greater than 90 degrees.

Front

What is an equilateral triangle?

Back

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

Front

What is an isosceles triangle?

Back

An isosceles triangle has at least two sides that are equal in length and the angles opposite those sides are equal.

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 a right triangle?

Back

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

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 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

Can a triangle be both right and equilateral?

Back

No, a triangle cannot be both right and equilateral.