Math Geo help Ms Sue?

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I have two questions about two circles.

A.First circle shows half a line measuring 4mm using 3.14 for pie. I came up with an answer that is wrong.:(


B.Second circle same pie but with a line all the way across the circle measuring 18cm. I got this one wrong?

Please help with steps on each? I want to understand what I got wrong so I can do better.

  • Math Geo help Ms Sue? -

    What questions are you trying to solve?

    Circumference? Area? ??

  • Math Geo help Ms Sue? -

    area

  • Math Geo help Ms Sue? -

    A. Radius = 4

    A = pi * r^2
    A = 3.14 * 4^2
    A = 3.14 * 16
    A = 50.24 sq. cm.

    B. Radius = 9 cm

    Solve this the same was that I solved A.

  • Math Geo help Ms Sue? -

    I really understand thank you.

  • Math Geo help Ms Sue? -

    You're welcome. :-)

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