Classify Angles and Triangles

Front

What type of angle is less than 90 degrees?

Back

Acute angle

Front

What type of angle is exactly 90 degrees?

Back

Right angle

Front

What type of angle is greater than 90 degrees but less than 180 degrees?

Back

Obtuse angle

Front

What type of angle is exactly 180 degrees?

Back

Straight angle

Front

What do you call angles that add up to 90 degrees?

Back

Complementary angles

Front

What do you call angles that add up to 180 degrees?

Back

Supplementary angles

Front

What type of triangle has all sides of different lengths?

Back

Scalene triangle

Front

What type of triangle has at least two equal sides?

Back

Isosceles triangle

Front

What type of triangle has all angles less than 90 degrees?

Back

Acute triangle

Front

What type of triangle has one angle greater than 90 degrees?

Back

Obtuse triangle