Question

AB is a diameter of a circle, centre O. C is a point on the circumference of a
circle, such that ∠CAB = 2 × ∠CBA. Find ∠CBA. (there is also a pic)

Answer 1

Answer:

60 degrees

Step-by-step explanation:

The diameter has a central angle of 180 degrees. For ∠CAB = 2 × ∠CBA, the sum of these two angles must be 180 degrees. That means CBA is 1/3 of the central angle for the diameter since CAB is 2 CBA and CBA+CBA+CBA=180 is 3*CBA=180. That means if you simplify, the answer is 60 degrees.

Answer 2

Answer:

hence ∠CBA = 30

hope this helps u....