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AOB is a diameter of a circle , C is a p...

AOB is a diameter of a circle , C is a point on the circle. If `angle OBC=60^(@)` , then find the value of `angleOCA`

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AOB is a diameter f a circle. C is a point on the circle `:. angle ACB=1` right angle or `90^(@)`
Again in `Delta OBC,OB= OC ( :. ` radii of same circle)
`:. angle OCB= angleOBC= 60^(@) [ :. angle OBC=60^(@)` (Given)]
`:. angleOCA= angle ACB- angleOCB= 90^(@)- 60^(@)=30^(@)`
`:. angleOCA= 30^(@)`
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