Helen needs a replacement ball bearing whose radius is 5.99mm
A sphere is a perfectly round geometrical 3-dimensional object. It can be characterized as the set of all points located distance r (radius) away from a given point (center). It is perfectly symmetrical, and has no edges or vertices.
The formula of surface area of the sphere is [tex]4\pi r^{2}[/tex] where r represents radius
Given: Surface area of ball = 452.16[tex]mm^{2}[/tex]
Using formula we get,
[tex]4\pi r^{2}[/tex] = 452.16[tex]mm^{2}[/tex]
r^2 = 452.16/4[tex]\pi[/tex]
r = 5.99 mm
Thus Helen needs a replacement ball bearing whose radius is 5.99mm
Learn more about Surface area here :
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