zachred14
zachred14 zachred14
  • 15-05-2021
  • Mathematics
contestada

This beach ball has a surface area of 379.94 inches². What is its diameter? Use 3.14 for π.

Respuesta :

watwolves8855
watwolves8855 watwolves8855
  • 15-05-2021

Answer:

11 inches

Step-by-step explanation:

We know that [tex]SA=4\pi r^2[/tex]. We know that [tex]SA=379.94[/tex] and that [tex]\pi\approx3.14[/tex]. We solve for [tex]r[/tex]: [tex]379.97=4\times3.14\times r^2[/tex]

[tex]r^2=30.25[/tex]

[tex]r=5.5[/tex]

Since [tex]d=2r[/tex], the diameter of the sphere is 11 inches.

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