Ratios and Pi
3 days ago
mathiscool
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10 QuestionsShow answers
  • Question 1
    120 seconds
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    Q.

    Which of the following formulas do we use to find the Circumference of a circle when given the radius?

    answer choices

    C = πdC\ =\ \pi d

    C = 2πrC\ =\ 2\pi r

    A = πr2A\ =\ \pi r^2

    C = πr2C\ =\ \pi r^2

  • Question 2
    120 seconds
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    Q.

    Which of these best describes  π?\pi?  

    answer choices

    The square root of the area of a circle.

    The ratio of the radius of a circle to its diameter.

    The radius of a circle times 3.14. 

    The ratio of the circumference of a circle to its diameter.

  • Question 3
    120 seconds
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    Q.

    Which of the following equations represents the relationship between the circumference, C, and the diameter, d, of any circle?

    answer choices

    C = πrC\ =\ \pi r

    Cd =πCd\ =\pi

    π= Cr\pi=\ \frac{C}{r}

    π=Cd\pi=\frac{C}{d}

  • Question 4
    60 seconds
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    Q.

    What number is pi?

    answer choices

    1.41

    3.14

    2

    5.14

  • Question 5
    60 seconds
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    Q.

    Which of these ratios is the closest approximation of pi?

    answer choices

    134\frac{13}{4}

    196\frac{19}{6}

    165\frac{16}{5}

    227\frac{22}{7}

  • Question 6
    60 seconds
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    Q.

    _______________ is the distance around a circle.

    answer choices

    circumference

    radius

    center

    diameter

  • Question 7
    60 seconds
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    Q.

    _____________ is half of the diameter

    answer choices

    circumference

    radius

    center

    diameter

  • Question 8
    60 seconds
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    Q.

    ______________ is twice the radius

    answer choices

    circumference

    radius

    center

    diameter

  • Question 9
    60 seconds
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    Q.

    If the radius of a circle is 12.5 meters, the diameter is _

    answer choices

    6.25 meters

    25 meters

    125 meters

    50 meters

  • Question 10
    60 seconds
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    Q.

    If the diameter of a circle is 50 yards, the radius is ______.

    answer choices

    100 yards

    150 yards

    25 yards

    15 yards

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