INTERIOR ANGLES of TRIANGLES

Front

What is the sum of the interior angles of a triangle?

Back

180 Degrees

Front

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

Back

Right triangle

Front

In a triangle, if two angles are 70 degrees and 40 degrees, what is the measure of the third angle?

Back

70 degrees (180 - 70 - 40 = 70)

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

If a triangle has angles measuring 60 degrees and 80 degrees, what is the measure of the third angle?

Back

40 degrees (180 - 60 - 80 = 40)

Front

What is the relationship between the angles in a triangle?

Back

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

Front

If one angle of a triangle is 100 degrees, what can you say about the other two angles?

Back

They must be acute angles (less than 90 degrees) because the sum must equal 180 degrees.

Front

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

Back

Missing angle = 180 - (sum of the other two angles)