1.

In `triangleABC, AC=BC`, S is the circum-center and `angleASB=150^(@)`. Find `angleCAB`. A. `55 (1/2^(@))`B. `52(1/2)^(@)`C. `90(1/2)^(@)`D. `35(1/2)^(@)`

Answer» Correct Answer - B
Since, SA=SB=SC, S is the circum-center
`angleASB=150^(@)` (given) `rArr angleACB=75^(@)`.
Since, AC=BC, `angleCAB=angleCBA=(180^(@)-75^(@))/2`
`=521/2^(@)`


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