Mensuration


  1. Two adjacent sides of a parallelogram are of length 15 cm and 18 cm. If the distance between two smaller sides is 12 cm, then the distance between two bigger sides is









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    Area of the parallelogram = Base × Height
    = 15 × 12 = 180 sq.cm.
    ∴ 180 = 18 × height
    ⇒ Height = 10 cm

    Correct Option: B

    Area of the parallelogram = Base × Height
    = 15 × 12 = 180 sq.cm.
    ∴ 180 = 18 × height
    ⇒ Height = 10 cm


  1. A parallelogram ABCD has sides AB = 24 cm and AD = 16 cm. The distance between the sides AB and DC is 10 cm. Find the distance between the sides AD and BC.









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    Area of the parallelogram = Base × Height
    = 24 × 10 = 240 sq.cm.
    If the required distance be x cm, then
    240 = 16 × x

    ⇒ x =
    240
    = 15 cm
    16

    Correct Option: C


    Area of the parallelogram = Base × Height
    = 24 × 10 = 240 sq.cm.
    If the required distance be x cm, then
    240 = 16 × x

    ⇒ x =
    240
    = 15 cm
    16



  1. The adjacent sides of a parallelogram are 36 cm and 27 cm in length. If the distance between the shorter sides is 12 cm, then the distance between the longer sides is









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    Area of parallelogram = base × height
    = 27 × 12 = 324 sq. cm.
    Again,
    324 = 36 × h

    ⇒ h =
    324
    = 9 cm
    36

    Correct Option: D

    Area of parallelogram = base × height
    = 27 × 12 = 324 sq. cm.
    Again,
    324 = 36 × h

    ⇒ h =
    324
    = 9 cm
    36


  1. If the diagonals of a rhombus are 8 and 6, then the square of its size is









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    BO = 4 units; OC = 3 units
    ∠BOC = 90°

    ∴ BC = √4² + 3² = 5 units
    ∴ BC² = 25 sq. units

    Correct Option: A

    BO = 4 units; OC = 3 units
    ∠BOC = 90°

    ∴ BC = √4² + 3² = 5 units
    ∴ BC² = 25 sq. units



  1. One of the four angles of a rhombus is 60°. If the length of each side of the rhombus is 8 cm, then the length of the longer diagonal is









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    ∠BAD = 60°
    ∴ ∠BAO = 30° ∠ABO = 60°

    ∴ sin 60° =
    OA
    AB

    3
    × 8 = OA
    2

    ⇒ OA = 4√3
    ∴ AC = 8√3 cm

    Correct Option: A


    ∠BAD = 60°
    ∴ ∠BAO = 30° ∠ABO = 60°

    ∴ sin 60° =
    OA
    AB

    3
    × 8 = OA
    2

    ⇒ OA = 4√3
    ∴ AC = 8√3 cm