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Illustration of complementary angles in geometry, where ∠AOB and ∠BOC sum to 90°.

$Diagram showing two complementary angles, ∠AOB and ∠BOC, forming a right angle at point O, with ∠AOB = 40° and ∠BOC = 50°.$

Diagram showing two complementary angles, ∠AOB and ∠BOC, forming a right angle at point O, with ∠AOB = 40° and ∠BOC = 50°.

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Show Answer Key & Explanations Step-by-step solution for: Grade 10 - Worksheets - Mathematics

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- Complementary angles are two angles whose measures add up to 90°.
- In the given example, ∠AOB = 40° and ∠BOC = 50°.
- Adding these measures: 40° + 50° = 90°.
- Since their sum is 90°, ∠AOB and ∠BOC are complementary angles.
- Therefore, ∠AOB is the complement of ∠BOC, and ∠BOC is the complement of ∠AOB.

Parent Tip: Review the logic above to help your child master the concept of gr 10 math worksheet.

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