Geometry: Angles Flash Cards

Learn angle types and their properties.

Free geometry: angles flash cards with 10 terms and definitions. Flip through each card to study, or shuffle for a new order. Printable for classroom or homework use.

Geometry: Angles Terms and Definitions

ACUTE
Angle measuring less than 90 degrees
RIGHT
Angle measuring exactly 90 degrees
OBTUSE
Angle measuring between 90 and 180 degrees
STRAIGHT
Angle measuring exactly 180 degrees
REFLEX
Angle measuring more than 180 degrees
COMPLEMENTARY
Two angles that add up to 90 degrees
SUPPLEMENTARY
Two angles that add up to 180 degrees
VERTICAL
Opposite angles formed by two intersecting lines
ADJACENT
Angles that share a side and a vertex
PROTRACTOR
Tool used to measure angles in degrees

About Geometry: Angles

Angles are everywhere in geometry, from the corners of a classroom to the spokes of a wheel. These flash cards help students learn the vocabulary of angles, including types, measurements, and relationships between angles.

Geometry: Angles Vocabulary

These flash cards pair angle terms with their definitions. Students flip cards to learn terms like ACUTE (an angle less than 90 degrees), OBTUSE (an angle between 90 and 180 degrees), and COMPLEMENTARY (two angles that add up to 90 degrees).

How to Use These Flash Cards in Class

After studying these flash cards, have students use a protractor to draw one example of each angle type on graph paper. Label each with its name and measurement. Post them as a class reference chart.

Printable Geometry: Angles Flash Cards

Click the print button to print these geometry: angles flash cards. The printable version lists all terms and definitions, perfect for classroom handouts or homework.

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