1. If I be the incentre of ΔABC and ∠B = 70° and ∠C = 50°, then the magnitude of ∠BIC is





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  • By: anil on 05 May 2019 01.55 am

    In $$ riangle$$ ABC => $$angle$$A + $$angle$$B + $$angle$$C = 180° => $$angle$$A + 70° + 50° = 180° => $$angle$$A = 60° Now, using properties of incentre, => $$angle$$BIC = 90° + $$frac{angle A}{2}$$ => $$angle$$BIC = 90° + $$frac{60^{circ}}{2}$$ => $$angle$$ = 120°
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