hamburger menu
All Coursesall course arrow
adda247
reward-icon
adda247
    Question


    A.

    60°

    B.

    80°

    C.

    30°

    D.

    40°

    Correct option is B

    3∠A = 4∠B = 6∠C
    X = 3∠A
    ∠A = x/3 ………….(i)
    X = 4∠B
    ∠B = x/4 ……….(ii)
    X = 6∠C
    ∠C = x/6 ………(iii)
    By using angle sum property
    ∠A + ∠B + ∠C = 180°
    Put the values of ∠A, ∠B, ∠C
    x/3 + x/4+ x/6 = 180°
    Let us find the L.C.M of 3, 4, 6 i.e. 12
    (4x + 3x + 2x) / 12 = 180°
    9x = 2160
    X = 240°
    Substitute the value of x in equation (i), (ii) and (iii)
    ∠A = x/3
    ∠A = 240/3
    So, ∠A = 80°

    Free Tests

    Free
    Must Attempt

    DSSSB PRT Full Mock - 01

    languageIcon English
    • pdpQsnIcon200 Questions
    • pdpsheetsIcon200 Marks
    • timerIcon120 Mins
    languageIcon English
    Free
    Must Attempt

    Educational Psychology & Pedagogy - 01

    languageIcon English
    • pdpQsnIcon20 Questions
    • pdpsheetsIcon20 Marks
    • timerIcon15 Mins
    languageIcon English
    Free
    Must Attempt

    DSSSB PRT PYP Held on 7th March 2022 Shift 1

    languageIcon English
    • pdpQsnIcon200 Questions
    • pdpsheetsIcon200 Marks
    • timerIcon120 Mins
    languageIcon English
    test-prime-package

    Access ‘REET’ Mock Tests with

    • 60000+ Mocks and Previous Year Papers
    • Unlimited Re-Attempts
    • Personalised Report Card
    • 500% Refund on Final Selection
    • Largest Community
    students-icon
    368k+ students have already unlocked exclusive benefits with Test Prime!
    Our Plans
    Monthsup-arrow