Finding Missing Angles in Triangles

Front

What is the sum of the angles in a triangle?

Back

180 Degrees

Front

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

Back

Right triangle

Front

What do you call a triangle with all angles less than 90 degrees?

Back

Acute triangle

Front

What do you call a triangle with one angle greater than 90 degrees?

Back

Obtuse triangle

Front

If two angles in a triangle are 30 degrees and 70 degrees, what is the measure of the third angle?

Back

80 degrees

Front

How do you find the missing angle in a triangle?

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the measure of the missing angle if the known angles are 50 degrees and 60 degrees?

Back

70 degrees

Front

In a triangle, if one angle is 40 degrees and another is 100 degrees, what is the missing angle?

Back

40 degrees

Front

What is the relationship between the angles in a triangle?

Back

The sum of the angles is always 180 degrees.

Front

If a triangle has angles measuring 30 degrees, 30 degrees, and x degrees, what is x?

Back

120 degrees