3.3 Triangle Angle Sum Theorem

Front

The Triangle Sum Theorem states that the sum of all angles in a triangle is ______.

Back

180°

Front

What is the third angle of a triangle whose 1st angle is 34° and 2nd angle is 101°?

Back

45°

Front

A right triangle has ______.

Back

one right angle

Front

Find the measure of the indicated angle if one angle is 34° and the other is 46°.

Back

34°

Front

Name this triangle: A triangle with angles measuring 30°, 60°, and 90°.

Back

Right, Acute

Front

What is an acute triangle?

Back

A triangle where all angles are less than 90°.

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths.

Front

What is an isosceles triangle?

Back

A triangle with at least two sides of equal length.

Front

What is an obtuse triangle?

Back

A triangle with one angle greater than 90°.

Front

What is the formula to find the third angle in a triangle?

Back

Third angle = 180° - (first angle + second angle)