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Asked by Girishdhawan | 01 Jul, 2018, 03:20: PM
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begin mathsize 16px style Given colon space bisector space of space straight B space and space straight C space meet space at space straight O. angle BOC space equals space 135 degree To space prove space colon space angle straight A space equals space 90 degree Proof colon In space increment ABC comma angle straight A space plus space angle straight B space plus space angle straight C space equals space 180 degree rightwards double arrow angle straight B space plus space angle straight C space space equals space 180 degree space minus space angle straight A space..... left parenthesis 1 right parenthesis In space increment OBC comma angle OBC space plus angle BOC space plus angle OCB space equals 180 degree rightwards double arrow angle OBC space plus angle OCB space equals space 180 degree space minus space 135 degree space equals space 45 degree rightwards double arrow 2 angle OBC space plus 2 angle OCB equals space 90 degree...... multiply space by space 2 rightwards double arrow angle straight B space plus space angle straight C space space equals 90 degree space rightwards double arrow 180 degree space minus space angle straight A equals 90 degree space space space space... from left parenthesis 1 right parenthesis rightwards double arrow angle straight A space equals space 90 degree space Hence space proved. end style
Answered by Yasmeen Khan | 05 Jul, 2018, 11:27: AM

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CBSE 9 - Maths
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