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= 60/360 × 3,14×20×20
= 1/60 × 1256 = 20,93
2. panjang busur = x/360 × 2πr
= 60/360 × 2×3,14×20
= 1/60 ×125,6
= 2,09
2.60/360X3,14X40=20,933.......
40 dapat dari diameter dan diameter itu 2 kali jari jari
Semoga Bermanfaat :)