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Maka :
K = 2 x π x r
300 = 2 x 3,14 x r
300 = 6,28 x r
r = 300 / 6,28
r = 47,77 cm
L = πx r²
= 3,14 x 47,77²
= 7.165, 500 cm²
2. pi .r =300
r = 150/pi
luas lingkaran = pi.r^2
= pi. (150/pi)^2
= 22500/3,14
= 71656 cm