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The tangent at a point C of a circle with centre O and a diameter AB when extended intersect at P. If ZPCA = 110° find the measure of ZCBA.
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∴ ∠CBA=70o.
Verified answer
Answer:
Solution
∠PCA = 110°
PC is the tangent to the circle whose centre is O.
Construction
Join points C and O.
∠BCA = 90° [Since angle in a semi circle is 90°]
Also ∠PCO = 90° [Since radius ⊥ tangent]
From the figure we have,
∠PCA =∠PCO + ∠OCA
i.e. 110° = 90° + ∠OCA
∴
∠OCA =20°
Now in ΔAOC, AO = OC [Radii]
So, ∠OCA = ∠OAC =20°
In ΔABC, we have
∠BCA = 90° & ∠CAB = 20°
∴
∠CBA = 70°