Triangle Angle Sum and Triangle Exterior Angle

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

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

Back

It is a right triangle.

Front

What are the remote interior angles of an exterior angle in a triangle?

Back

The remote interior angles are the two angles that are not adjacent to the exterior angle.

Front

How do you find the measure of an exterior angle of a triangle?

Back

The measure of an exterior angle is equal to the sum of the measures of the two remote interior angles.

Front

If angle A = 45 degrees and angle B = 55 degrees, what is angle C in triangle ABC?

Back

Angle C = 180 - (45 + 55) = 80 degrees.

Front

What is the relationship between the angles in a triangle?

Back

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

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 the formula to calculate the sum of angles in a triangle?

Back

The formula is: Angle A + Angle B + Angle C = 180 degrees.

Front

If angle D is an exterior angle, how do you express it in terms of the interior angles?

Back

Angle D = Angle A + Angle B (where A and B are the remote interior angles).