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L = 1.256 cm
ditanya K ?
maka :
L = π x r²
1256 = 3,14 x r²
r² = 1256 : 3,14
r = √400
r = 20 cm
jadi :
K = 2 x π x r
= 2 x 3,14 x 20
= 125,6 cm
1256=3,14.r²
r² = 1256:3,14
r² = 400
r = √400
= 20
K = 3,14.D
= 3,14.2.20
= 3,14.40
= 125,6