Properties of Triangles

Front

What is a triangle?

Back

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

Front

What are the types of triangles based on side lengths?

Back

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

Front

What is the Triangle Inequality Theorem?

Back

The sum of the lengths of any two sides of a triangle must be greater than the length of the third side.

Front

What is an isosceles triangle?

Back

An isosceles triangle has at least two sides that are equal in length.

Front

What is a right triangle?

Back

A right triangle has one angle that measures 90 degrees.

Front

What is the sum of the interior angles of a triangle?

Back

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

Front

If two angles of a triangle are 45° each, what type of triangle is it?

Back

It is an isosceles right triangle.

Front

What is the longest side of a right triangle called?

Back

The longest side of a right triangle is called the hypotenuse.

Front

How do you determine if three lengths can form a triangle?

Back

Use the Triangle Inequality Theorem: The sum of the lengths of any two sides must be greater than the length of the third side.

Front

What is a scalene triangle?

Back

A scalene triangle has all sides of different lengths.