Triangle Angle Sum and Exterior Angles

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 type of angle is less than 90 degrees?

Back

Acute angle.

Front

What type of angle is exactly 90 degrees?

Back

Right angle.

Front

What type of angle is greater than 90 degrees but less than 180 degrees?

Back

Obtuse angle.

Front

What type of angle is exactly 180 degrees?

Back

Straight angle.

Front

What is an exterior angle of a triangle?

Back

An exterior angle is formed by one side of the triangle and the extension of an adjacent side.

Front

What is the relationship between an exterior angle and the two opposite interior angles?

Back

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

Front

If one angle of a triangle is 60 degrees and another is 70 degrees, what is the third angle?

Back

50 degrees.

Front

Can a triangle have one angle that is greater than 90 degrees?

Back

Yes, it is called an obtuse triangle.

Front

What is the maximum number of obtuse angles a triangle can have?

Back

One obtuse angle.