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Matematika SMP Kelas 8
Panjang busur = 2π.R x α/360°
8,8 = 2 x ²²/₇ x R x 144°/360°
0,2 x 7 = R x 0,4
R = 7 x ¹/₂
Jadi jari-jari adalah 3,5 cm