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secondary 3 | A Maths
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B & C ???
For part b) when you extend line BT past the line AC, you form an angle of 180-75=105 degrees.
However when you extend line BS past the line AC, you form an angle of 180-90=90 degrees. (Angle CBS is 75+15=90degrees)
Try using this rule and methodology to solve part c)! Dont be afraid to ask for help if you are unable to do so though
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