Question 1133040
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The area of a circle is {{{(pi)(r^2)}}}.<br>
The area of 4 circles each with the same radius is {{{4(pi)(r^2)}}}.<br>
The surface area of a sphere is {{{(4pi)(r^2)}}}.<br>
Those last two area formulas are identical; the surface area of a sphere with radius r is equal to the areas of 4 circles with radius r.<br>
Since in this problem the circles have radius 7, the sphere also has radius 7.