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r²= A*π r = √(Aπ)
5)C = 2πr
r = C/2π
6)V = abc
a = V/bc b = V /ac y c = V/b
7) V = πr²h
h = V/πr² r²= V/πh ⇒r = √(V/πh)
8)V = (1/3)b*h
b = 3V/h y h = 3V/b
9)V = (1/3) πr²
r²=3V/π ⇒r = √(3V/π)
10) V = (4/3)πr²
r²= 3V/4π ⇒r = √(3V/4π)
11) S=4πr²
r²= S/4π ⇒ r=√(S/4π)