Angle Sum of Triangles

Front

What is the sum of the angles inside a triangle?

Back

180°

Front

If two angles of a triangle are 70° and 60°, what is the measure of the third angle?

Back

50°

Front

What do you call an angle that measures less than 90°?

Back

Acute angle

Front

What do you call an angle that measures exactly 90°?

Back

Right angle

Front

What do you call an angle that measures more than 90° but less than 180°?

Back

Obtuse angle

Front

In a triangle, if one angle measures 90°, what type of triangle is it?

Back

Right triangle

Front

If a triangle has angles measuring 30° and 60°, what is the measure of the third angle?

Back

90°

Front

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

Back

60°

Front

If the angles of a triangle are in the ratio 2:3:4, what are the measures of the angles?

Back

40°, 60°, 80°

Front

What is the relationship between the angles of a triangle and its exterior angle?

Back

The exterior angle is equal to the sum of the two opposite interior angles.