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

Can a triangle have angles measuring 90°, 45°, and 45°?

Back

Yes, this 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

What is a scalene triangle?

Back

A scalene triangle is a triangle where all three sides have 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

What is an equilateral triangle?

Back

An equilateral triangle is a triangle where all three sides are of equal length and all angles are 60 degrees.

Front

If one angle of a triangle is 58°, what is the maximum possible measure of the other two angles?

Back

The maximum possible measure of the other two angles is 122° (since 180° - 58° = 122°).

Front

What is the measure of the third angle if two angles of a triangle are 34° and 136°?

Back

The measure of the third angle is 10° (since 180° - 34° - 136° = 10°).