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  • Concurrency in Traingles

    Q


    ∠ A = 2a and ∠B = 2b (let) and Join D and E.
    AB = CD and� ∠ B = 2 ∠C �(given)
    So, ∠ C = b.������
    In ∆ BEC , we have
    ∠EBC = ∠ECB = y
    So, EB = EC ………(i)
    In ∆ ABE and ∆ DCE , we have
    AB = DC
    ∠ABE = ∠DCE = y
    and BE = CE (from (i))
    so, ∆ABE ≅ ∆DCE .
    so, AE = DE and ∠BAE = ∠EDC = 2a (by cpct)
    Now, in ∆AED ,
    AE = DE
    So, ∠ EAD = ∠EDA = a.
    So, ∠ADC = ∠EDA + ∠EDC = a + 2a = 3a. …(ii)
    ∠ADC = ∠DAB + ∠DBA (ex. Angle)
    3a = a + 2b
    So, a = b ….(iii)
    Now, in ∆ABC , we have
    ∠A + ∠B + ∠C = 180°
    2a + 2b + b = 180°
    2a + 2a + a = 180° (from eqn.(iii))
    5a = 180°
    So, a = 36°.
    So, ∠BAC = 2a = 72°.

    A
  • dehli sultans

    Q

    Answer.

    Qutb al-Din Aibak, a former slave of Muhammad Ghori, was the first sultan of Delhi and his dynasty conquered large areas of northern India. Afterwards, the Khalji dynasty was also able to conquer most of central India, but both failed to unite the Indian subcontinent.

    A
  • m2-3n-+2 and m2+m-6

    Q

    I think question is not correct and not complete.
    I think we have to find LCM and HCF of m2-3m-2 and m2+m-6
    First factorize it
    m2-3m+2 = (m-1)(m-2)
    m2+m-6 = (m+3)(m-2)


    LCM = (m-1)(m-2)(m+3)
    HCF = (m-2)

    A
  • 12+5

    Q

    17

    A
  • What is prokaryotic and eukaryotic

    Q

    Answer.

    Eukaryotic cells contain membrane-bound organelles, including a nucleus. 
    Prokaryotic cells do not contain a nucleus or any other membrane-bound organelle.

    A
  • (x+2)(x+3)

    Q

    (x+2)(x+3)
    (x+a)(x+b)=x*x+(a+b)x+ab
    x*x+5x+6

    A
  • Types of sentences

    Q

    Ans: Imperative sentences
            Interrogative sentences
            Exclamatory sentences
            Assertive sentences

    A
  • 184.96

    Q

    34210.2016

    A
  • Q

    -2

    A
  • Q

    in order for your body to grow, you have to increase the number of cells in your body which requires that your cells to go through mitosis. In addition, you have to replace the cells that are constantly dying, this also requires that mitosis occur.

    Sharon, Westview Learning Center

    A

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