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Math

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Find the area of each circle use 22/7 for pie.

1. r=14ft

2.d=3 1/3 yd

  • Math - ,

    A = pi r^2
    A = (22/7)(14)^2 , you do arithmetic
    answer in square feet (ft^2)

    in the second one r = D/2
    so r = (1/2)(10/3) = 5/3 yard
    so
    A = pi r^2
    A = (22/7)(25/9) you do arithmetic
    in square yards (yd^2)

  • Math - ,

    The formula for the area of a circle is A = pi*r^2

    1.
    A = 22/7 * 14 * 14
    A = ?

    2. In this problem, you need to find the radius -- which is 1/2 of the diameter.
    A = 22/7 * 1 2/3 * 1 2/3
    A = ?

    If you post your answers, we'll be glad to check them.

  • Math - ,

    You were given two questions:

    Find the area of each circle use 22/7 for pie.

    1. r=14ft

    2.d=3 1/3 yd

    First of all, it's not pie; it's pi.

    Pie is something we eat; pi is an irrational number. The symbol for pi is ð.

    The area of a circle formula is:

    Area = pi times radius squared, which is written A = ð(r)^2.

    We are looking for A, where A represents the area of the circle.

    A = ð(14ft)^2

    A = (22/7)(14ft)^2

    A = 616 ft^2....This is read: "616 square feet." Why square feet? Area is measured in square units.

    ==================================

    For the second question, you were given the diameter as a mixed number.

    Your diameter is 3_1/3, which I will write as an improper fraction (10/3).

    We need the radius in order to plug it into the area formula as given above.

    The radius is 1/2 of the diameter.

    So, (10/3) times (1/2) = (5/3)

    The fraction (5/3) is our radius here.

    We now plug (5/3) for r in the formula for the area of a circle and simplify.

    A = ð(r)^2

    A = (22/7)(5/3)^2

    A = (22/7)(25/9)

    A = 550 yards^2...This is read: "550 square yards.

    That's it!

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