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27, 72 = 4 x ²²/₇ x r²
27,72 = ⁸⁸/₇ x r²
r² = 27,72 x ⁷/₈₈
r² = 2, 205
r = √2,205
r = 1, 48 cm
3.22/7.r² = 27,72
66/7.r² = 27,72
r² = 27,72 . 7/66
r = √2,94 =1,71
maaf kalo salah