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  • Question
  • Consider the following statements: 1) The perimeter of a triangle is greater than the sum of its three medinas. 2) In any triangle ABC, if D is any point on BC, then AB + BC + CA > 2AD. Which of the above statements is/are correct?


  • Options
  • A. 1 only
  • B. 2 only
  • C. Both 1 and 2
  • D. Neither 1 nor 2

  • Correct Answer
  • Both 1 and 2 

    Explanation
    Let ABC be the triangle and D. E and F are midpoints of BC, CA and AB respectively.
    Recall that the sum of two sides of a triangle is greater than twice the median bisecting the third side,(Theorem to be remembered)
    Hence in ?ABD, AD is a median
    ?
    AB + AC > 2(AD)
    Similarly, we get
    BC + AC > 2CF
    BC + AB > 2BE
    On adding the above inequations, we get
    (AB + AC) + (BC + AC) + (BC + AB )> 2AD + 2CD + 2BE
    2(AB + BC + AC) > 2(AD + BE + CF)
    ?
    AB + BC + AC > AD + BE +CF
     
    2.
    To prove: AB + BC + CA > 2AD
    Construction: AD is joined
    Proof: In triangle ABD,
    AB + BD > AD [because, the sum of any two sides of a triangle is always greater than the
    third side]
    ----
    1
    In triangle ADC,
    AC + DC > AD [because, the sum of any two
    sides of a tri
    angle is always greater than the
    third side]
    ----
    2
    Adding 1 and 2 we get,
    AB + BD + AC + DC > AD + AD
    => AB + (BD + DC) + AC > 2AD
    => AB + BC + AC > 2AD
    Hence proved
  • Tags: Bank Exams

    More questions

    • 1. 
      A person sold an article for ? 3600 and got a profit of 20%. Had he sold the article for ? 3150, how much profit would he have got?

    • Options
    • A. 4%
    • B. 5%
    • C. 6%
    • D. 10%
    • Discuss
    • 2. 
      Two lots of onions with equal quantity, one costing ? 10 per kg and the other costing ? 15 per kg, are mixed together and whole lot is sold at ? 15 per kg. What is the profit or loss?

    • Options
    • A. 10% loss
    • B. 10% profit
    • C. 20% profit
    • D. 20% loss
    • Discuss
    • 3. 
      By selling 32 orange for ? 30 a man loses 25%. How many oranges should be sold for ? 24 so as to gain 20% in the transaction?

    • Options
    • A. 16
    • B. 24
    • C. 32
    • D. 28
    • Discuss
    • 4. 
      Kamlesh purchased 120 reams of paper at ? 100 per ream and the expenditure on transport was ? 480. He had to pay an octroi duty of 50 paise per ream and the coolie charges were ? 60. What should he charge per ream to gain 40%?

    • Options
    • A. ?155
    • B. ? 147
    • C. ? 138
    • D. ? 165
    • Discuss
    • 5. 
      A dishonest dealer sells his goods at 10% loss on cost price and uses 30% less weight. What is his profit or loss per cent?

    • Options
    • A. 284/7 % loss
    • B. 283/7 % gain
    • C. 283/7 % loss
    • D. 284/7 % gain
    • Discuss
    • 6. 
      A man sold two houses for ? 96000 each. In the sale of the first house, he incurred 20% profit and in the sale of the second, he incurred 20% loss. what is the gain or loss percentage in total?

    • Options
    • A. 6% gain
    • B. 6% loss
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    • Discuss
    • 7. 
      A man sold two watches, each for ? 495. If he gained 10% on one watch and suffered a loss of 10% on the other, then what is the loss of gain percentage in the transaction?

    • Options
    • A. 1 % gain
    • B. 1% loss
    • C. 100/99% loss
    • D. Neither gain nor loss
    • Discuss
    • 8. 
      A person sold an article for ? 136 and got 15% loss, had he sold it for ? N, he would have got a profit of 15%. Which one of the following is correct?

    • Options
    • A. 190 < N < 200
    • B. 180 < N < 190
    • C. 170 < N < 180
    • D. 160 < N < 170
    • Discuss
    • 9. 
      A Seller uses 920g in place of one kg to sell his goods. When he sells his article at 15% gain on cost price, the actual percentage of profit is?

    • Options
    • A. 20%
    • B. 15%
    • C. 25%
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    • Discuss
    • 10. 
      A shopkeeper sells transistors at 15% above its cost price. If he had bought it at 5% more than what he paid for it and sold it for ? 6 more, he would have gained 10%. The cost price of the transistor is?

    • Options
    • A. ? 800
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    • C. ? 1200
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    • Discuss


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