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= 25:2
= 12,5
L = pixrxr
= 3,14x12,5x12,5
=490,65 cm^2
b.r=d:2
=18:2
= 9
L= pixrxr
= 3,14x9x9
= 254,34 cm^2
maaf kl slh^^
luas = πr²
= 3,14 x 12,5 x 12,5
= 490,625 cm²
b) d = 18 cm r = 9 cm
luas = πr²
= 3,14 x 9 x 9
= 254,34 cm²
semoga membantu ^^