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CBSE Class 9 Answered

Please solve question no 10 with proper explanation 
Asked by adityaahuja099 | 20 Nov, 2017, 07:57: PM
answered-by-expert Expert Answer
 
begin mathsize 16px style Arc space BC space makes space angle BOC equals straight z space at space the space centre space and space angle BAC equals straight x space on space circumference rightwards double arrow straight z equals 2 straight x straight i right parenthesis space In space triangle OBC comma angle OBC plus angle OCB plus angle BOC equals 180 degree rightwards double arrow straight y plus straight y plus straight z equals 180 degree rightwards double arrow 2 straight y plus straight z equals 180 degree rightwards double arrow 2 straight y plus 2 straight x equals 180 degree rightwards double arrow straight x plus straight y equals 90 degree rightwards double arrow angle BAC plus angle OBC equals 90 degree ii right parenthesis space In space triangle OBC comma angle OBC plus angle OCB plus angle BOC equals 180 degree rightwards double arrow straight y plus straight y plus straight t equals 180 degree rightwards double arrow straight t equals 180 degree minus 2 straight y Now comma space straight z equals 360 degree minus straight t rightwards double arrow straight z equals 360 degree minus left parenthesis 180 degree minus 2 straight y right parenthesis rightwards double arrow 2 straight x equals 180 degree plus 2 straight y rightwards double arrow 2 straight x minus 2 straight y equals 180 degree rightwards double arrow straight x minus straight y equals 90 degree rightwards double arrow angle BAC minus angle OBC equals 90 degree end style
Answered by Rashmi Khot | 30 Nov, 2017, 10:05: AM

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