Basic Geometry Terms

What is the term for two angles whose measures add up to 180 degrees?

• Supplementary angles

• Complementary angles

• Adjacent angles

• Vertical angles

If two angles are equal and together form a straight line, each angle is called what?

• Right angle

• Acute angle

• Obtuse angle

• Straight angle

What type of angle measures exactly 180 degrees?

• Acute angle

• Right angle

• Straight angle

• Reflex angle

If two angles add up to 90 degrees, they are called what?

• Supplementary angles

• Complementary angles

• Adjacent angles

• Vertical angles

This proceeds infinitely from a definite starting point. 

• segment
• line 
• ray

What is the measure of a straight angle?

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

Which angle appears to be acute?

• EKF

• DJK

• LIJ

• AIL

This is a finite or measurable piece of a line. 

• segment 
• ray 
• line

An angle that measures more than 90 degrees but less than 180 degrees is called what?

• Acute angle

• Right angle

• Obtuse angle

• Straight angle

Which measure is most likely the measurement of angle ABC?

• 100 degrees

• 85 degrees

• 30 degrees

• 125 degrees