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126 derajat 77 cm
---------------- = ----
360 derajat x (untuk mencari keliling lingkaran)
Berarti, x = 77 x 360 / 126 = 220 cm <<<< Keliling
Selanjutnya,
K. O =
220 = 2. 22/7 . x
X = 35 cm
Jadi, jawabannya D