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7 July, 17:12

If the circumference of a spherical object is 43.96 cm, what is the surface area of the object? Use 3.14 for pi im doing math with surface area fora sphere

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Answers (2)
  1. 7 July, 18:04
    0
    C=2pir

    SA=4pir^2

    43.96=2pir

    divide both sides by 2

    21.98=pir

    divide both sides by pi (aprox pi to 3.14)

    7=r

    SA=4pir^2

    SA=4pi7^2

    SA=4pi49

    SA=196pi

    aproxpi=3.14

    sa=615.44 cm^2
  2. 7 July, 20:07
    0
    Solutions

    Finding the sum of all the areas of each face on a 3-D object is called calculating the surface area. To calculate the surface area you use the formula c=2πr.

    Calculate

    SA = 4πr²

    43.96 = 2 πr

    Divide each of the side by 2

    43.96 = 2πr : 2

    21.98 = πr

    divide both sides by π (approximate π to 3.14)

    7=r

    SA=4πr²

    SA=4π7²

    SA=4π49

    SA=196pi

    SA = 615.44 cm²
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