Triangle Angle Sum + Exterior Angles- Graded

Front

What is the Triangle Angle Sum Theorem?

Back

The Triangle Angle Sum Theorem states that the sum of the interior angles of a triangle is always 180 degrees.

Front

What is an exterior angle of a triangle?

Back

An exterior angle of a triangle is formed by one side of the triangle and the extension of an adjacent side. The measure of an exterior angle is equal to the sum of the measures of the two opposite interior angles.

Front

Classify a triangle with one angle greater than 90 degrees.

Back

It is classified as an obtuse triangle.

Front

Classify a triangle with all sides of different lengths.

Back

It is classified as a scalene triangle.

Front

What is the measure of each angle in an equilateral triangle?

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

If one angle of a triangle is 50 degrees and another is 60 degrees, what is the measure of the third angle?

Back

The third angle measures 70 degrees (180 - 50 - 60 = 70).

Front

What is the relationship between the exterior angle and the interior angles of a triangle?

Back

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

Front

If a triangle has angles measuring 30 degrees and 60 degrees, what is the measure of the third angle?

Back

The third angle measures 90 degrees (180 - 30 - 60 = 90).

Front

What type of triangle has exactly two equal sides?

Back

It is classified as an isosceles triangle.

Front

Solve for x if the angles of a triangle are x, x, and 40 degrees.

Back

x = 70 degrees (2x + 40 = 180, so 2x = 140, thus x = 70).