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452,16=3,14.r²
r²=452,16 / 3,14
r²=144
r=√144
r=12
d=2r
d=2.12cm
d=24cm
jadi diameternya 24 cm yaaaa
:) lalalalalala
L = 452,16 cm²
maka :
L = 3,14 x r²
452,16 = 3,14 x r²
r² = 452,16 / 3,14
r = √144
r = 12 cm
maka diameter = 2 x 12 = 24 cm