7th Grade Math

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Find the area of the circle described. Use pi= 22/7.

Diameter= 1.4cm

Please help!

  • 7th Grade Math -

    Area = pi * r^2

    Radius = 0.7 or 7/10

    A = 22/7 * 49/100
    A = 1078/700
    A = 1 54/100 = 1 27/50 square centimeters

  • 7th Grade Math -

    the circumference of a circle and the perimeter of a square are both 40 cm. which has a greater are.the circle or the square?find the circumference

  • 7th Grade Math shr=er -

    First, if you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where it is more likely to be overlooked.

    Second, you have already stated the circumference of the circle.

    If the perimeter of a square = 40 cm, each side must 10 cm, giving you an area 10*10 = 100 cm.

    Circle circumference = π d = 40, where d = diameter

    Therefore d = 40/π

    Circle area = 1/4 π d^2 = 1/4 π (40/π)^2

    Insert d value from first equation into the second, solve for area and compare to square area.

  • 7th Grade Math -

    if its the diamater you just cut that in half to make the radius then you do that times pie which is 3.14 or 22/7. you welcome(:

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