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Year 7 · Shapes & Geometry
Complementary, supplementary and parallel-line angles
Some angle pairs have a fixed total: complementary angles make 90°, supplementary angles make 180°.
How to do it
- Decide what the pair adds up to.
- Subtract the angle you know.
Worked example
Two angles are vertically opposite. One is 94°. What is the other, in degrees?
Vertically opposite angles are equal, so the other angle is also 94°.
Answer: 94
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Watch outVertically opposite angles are equal, not supplementary.
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