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Sudut x = 2 × 25° = 50° (d)
12.
Sudut yang menghadap busur setengah lingkaran besarnya 90° (c)
13.
Panjang busur
= 60°/360° × 22/7 × 14
= 1/6 × 22 × 2
= 7,333 cm (b)