Subject

    Bank Exam

    Topic

    Joint Recruitment Test for 5 Banks - (Cash) - 11.03.2022

    Consider ∆ABD such that angle ADB=20⁰ and C is a point on BD such that AB=AC and CD=CA.Then the measure of angle ABC is-

    ক)
    30⁰
    খ)
    40⁰
    গ)
    45⁰
    ঘ)
    60⁰

    Explanation

    এখানে ,AB=AC=CD এবং ∠ADB=20⁰ ∴∠CAD=20⁰ তাহলে ,∠ACD=180⁰-(∠ADB+∠CAD) =180⁰-(20⁰+20⁰) =180⁰-40⁰ =140⁰ ∴∠ACB=180⁰-140⁰ =40⁰ যেহেতু AC=AB সেহেতু ∠ACB=∠ABC=40⁰

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