GEOMETRY | Finding Surface Area of Spheres | Sphere: circumference of great circle = π cm (how am i supposed to answer that without a number

Question

GEOMETRY | Finding Surface Area of Spheres | Sphere: circumference of great circle = π cm (how am i supposed to answer that without a number in centimeters)

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Iris 1 week 2021-09-14T22:04:41+00:00 2 Answers 0

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    0
    2021-09-14T22:06:23+00:00

    Answer:

    π cm²

    Step-by-step explanation:

    Circumference = 2πr

    π = 2πr

    r = ½

    Surface area of a sphere:

    4πr²

    4π(½)²

    4π(¼)

    π

    0
    2021-09-14T22:06:31+00:00

    Answer:

    SA = pi cm^2

    Step-by-step explanation:

    The circumference is given by

    C = 2 * pi *r

    Pi = 2 * pi *r

    Divide each side by 2 pi to find the radius

    pi/ 2 pi = 2 pi * r/ 2 pi

    1/2 = r

    We want to find the surface area

    SA = 4 pi r^2

    SA = 4 pi (1/2)^2

    SA = 4 * pi *1/4

    SA = pi

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