In the diagram below; O is the centre of the circle and |BD| = |DC|.
MATHEMATICS
WAEC 1995
In the diagram below; O is the centre of the circle and |BD| = |DC|. If ?DCB = 35°, find ?BAO.
- A. 20°
- B. 25°
- C. 30°
- D. 35°
Correct Answer: A. 20°
Explanation
< DBC = 35° (base angles of an isosceles triangle)
< CDB = 180° - (35° + 35°)
= 110°
< ADB = 70°; < ADB = 90°
\(\therefore\) < BAO = 180° - (70° + 90°)
= 20°
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