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maka
luas lingkaran adalah 346 , 5 ...
66 = 22/7 x diameter
diameter = 22/7 : 66
= 7/22 x 66
= 21
Luas = 22/7 x r x r
Luas = 22/7 x 10,5 x 10,5
= 346,5
maaf kalau telat