Angles of a Triangle

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180°.

Front

What are the three types of angles based on their measures?

Back

Acute (less than 90°), Right (exactly 90°), Obtuse (greater than 90°).

Front

Can a triangle have two obtuse angles?

Back

No, a triangle cannot have two obtuse angles because the sum of angles must equal 180°.

Front

What is an equilateral triangle?

Back

An equilateral triangle has all three sides equal and all angles measuring 60°.

Front

What is an isosceles triangle?

Back

An isosceles triangle has at least two sides equal 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

If one angle of a triangle is 90°, what type of triangle is it?

Back

It is a right triangle.

Front

What is the relationship between the sides and angles of a triangle?

Back

In a triangle, the larger the angle, the longer the opposite side.

Front

How do you find the measure of a missing angle in a triangle?

Back

Subtract the sum of the known angles from 180°.

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.