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d = 2(2x)
d = 4x
L = 1/2 π · r²
L = 1/2 · x · x
L = x²
K = 1/2π · d
K = 1/2 · 4x
K =
diameter = 4x
K total =
luas.1/2 lingk=1/2 πr²
=1/2π(2x)²=1/2π4.(x²)
=2.3,14.x²
=6,28x²
keliling=2πr
k.1/2 lingk=πr=3,14.2x=6,28x