1. If a straight line L makes an angle θ (θ > 90°) with the positive direction of x­ axis, then the acute angle made by a straight line L 1 , perpendicular to L, with the y­axis is





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  • By: anil on 05 May 2019 01.51 am
    Here, $$L perp L_1$$ => $$angle$$OCA = $$frac{pi}{2}$$ $$angle$$CAO = $$pi - heta$$ In $$ riangle$$OAC => $$angle$$CAO + $$angle$$OCA + $$angle$$COA = $$pi$$ => $$angle$$COA = $$pi - frac{pi}{2} - (pi - heta)$$ = $$ heta - frac{pi}{2}$$ $$ herefore$$ $$angle$$BOC = $$frac{pi}{2} - ( heta - frac{pi}{2})$$ = $$pi - heta$$
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