6.8A Triangle Sides and Angles

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

What is the Triangle Inequality Theorem?

Back

The Triangle Inequality Theorem states that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side.

Front

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

Back

It is a right triangle.

Front

What is an acute triangle?

Back

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

Front

What is an obtuse triangle?

Back

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

Front

Can a triangle have two right angles?

Back

No, a triangle cannot have two right angles because the sum of the angles would exceed 180 degrees.

Front

What are the side lengths of a triangle that can form a triangle?

Back

The side lengths must satisfy the Triangle Inequality Theorem.

Front

If the sides of a triangle are 5 cm, 12 cm, and 13 cm, does it form a triangle?

Back

Yes, it forms a triangle because 5 + 12 > 13, 5 + 13 > 12, and 12 + 13 > 5.

Front

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

Back

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

Front

What is the formula to find the missing angle in a triangle?

Back

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