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d = 40 cm
jd r = 40/2 = 20 cm
maka :
L = π x 20²
= 3,14 x 400
= 1.256 cm²
Dik: -D=40 cm
-r= 40/2= 20 cm
-π=3,14
Dit: L?
jawab: L= 3,14 × 20²
= 3,14×400 = 1256