Find the supplementary/complementary angle

Diagram

∠ABD + ∠DBC = 90°

∠ABD + 30° = 90°

∠ABD = 90° − 30°

∠ABD = 60°

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Chapter 4: Geometry - Exercise 4.2 [Page 81]

Chapter 4 Geometry
Exercise 4.2 | Q 12. (ii) | Page 81

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