I guess you are referring to a circle with area 120 m2 and want to know its radius:
area_circle = π x radius2
⇒ radius = √(area_circle ÷ π)
= √(120 m2÷ π)
≈ 6.18 m
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The radius is 16.5 inches.
4m because V=BxHso H =120/30=4
Since area equals Pi times radius squared take and substitute what is known. 345 equals Pi times the radius squared. divide Pi into both sides for 109.8 equals the radius squared. Now take the square root of 109.8 to get an r of 10.47936 cm.
A radius squared fits pi times into a circle (The area of a circle divided by pi is the radius squared).
pi*radius squared