Supplementary angles
Supplementary angles add up to a straight line.
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Two angles are supplementary. One measures 85°. What does the other measure?
Answer: 95°
Angle A and angle B are supplementary. One measures 10°. What does the other measure?
Answer: 170°
Two angles make a straight line together (they are supplementary). One measures 150°. What does the other measure?
Answer: 30°
Tip: Supplementary angles add up to a straight line.
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- Next in this topic Find a missing angle measure Fourth Class
Curriculum
Common Core: 4.MD.C.7
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On paper: this skill is in the printable pack Grade 4 Common Core Math: Geometry and Measurement, with an answer key.
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