Properties of Triangles

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

What is an acute triangle?

Back

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

Front

What is an obtuse triangle?

Back

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

Front

What is a right triangle?

Back

A right triangle is a triangle that has one angle equal to 90º.

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle where all three sides are of different lengths.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length.

Front

How do you find the missing angle in a triangle?

Back

To find the missing angle, subtract the sum of the known angles from 180º.

Front

What is the exterior angle theorem?

Back

The exterior angle of a triangle is equal to the sum of the two opposite interior angles.

Front

What is the Pythagorean theorem?

Back

In a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides (a² + b² = c²).

Front

What is the definition of a triangle?

Back

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