Triangle Sum Theorem

Front

What is the Triangle Sum Theorem?

Back

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

Front

Will the following three angles form a triangle? 30°, 60°, 90°

Back

Yes, because 30 + 60 + 90 = 180 degrees.

Front

What type of angle is 90 degrees?

Back

A right angle.

Front

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

Back

Each angle 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 is 70 degrees (50 + 60 + x = 180, so x = 70).

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

If a triangle has angles measuring 40 degrees and 100 degrees, will it form a triangle?

Back

No, because 40 + 100 = 140, which is less than 180 degrees.

Front

Find the measure of each angle indicated: 62, 53, 71, 50. Which is the largest?

Back

71 degrees is the largest angle.

Front

What is the sum of the angles in a triangle?

Back

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