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 sides?

Back

1. Scalene: All sides are different lengths. 2. Isosceles: Two sides are of equal length. 3. Equilateral: All three sides are of equal length.

Front

What are the types of triangles based on angles?

Back

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

Front

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

Back

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

Front

How do you find the missing angle in a triangle?

Back

Subtract the sum of the known angles from 180º.

Front

What is an isosceles triangle?

Back

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

Front

What is a scalene triangle?

Back

A scalene triangle has all sides of different lengths.

Front

What is an equilateral triangle?

Back

An equilateral triangle has all three sides of equal length and all angles measuring 60º.

Front

What is the definition of an obtuse triangle?

Back

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

Front

What is the definition of an acute triangle?

Back

An acute triangle has all angles measuring less than 90º.