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π = 3,14
Ditanya L....?
K = 2 π r
188,4 = 2 . 3,14 r
r = 188,4 / 6,28
r = 30cm
maka L lingkaran = π r²
L = 3,14 . 30 . 30
L = 2826cm²
= 188,4 : 3,14
= 60 cm
jari-jari = 60 : 2 = 30 cm
luas lingkaran = π x r²
= 3,14 x 30 x 30
= 2826 cm²