B. In the given figure, O is the centre of the circle. If 2 AOB = 90° and
L ABC = 30°. then
find:
[3]
8/09
THE
8
i)
2 САО
ii) 2 ACB
Give reasons to support your answers.
clase assessment of 5 marks is
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In AOAB, ∠OAB + ∠ABO + ∠BOA = 180°
∠OAB + ∠OAB + 90° = 180° ⇒ 2∠OAB = 180°- 90°
[angles opposite to equal sides are equal] [angle sum property of a triangle] [from Eq. (i)]
⇒ ∠OAB = 90°/2 = 45° …(i)
In ΔACB, ∠ACB + ∠CBA + ∠CAB = 180°
∴ 45°+ 30°+ ∠CAB = 180°
⇒ ∠CAB = 180° – 75° = 105°
∠CAO+ ∠OAB = 105°
∠CAO + 45° = 105°
∠CAO = 105° – 45° = 60°
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