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Panjang lintasan = 314 cm × 45 = 14.130 cm
7. Sudut AOB = 60°
A. Luas lingkaran = 360/60 × luas juring AOB = 6× 462 = 2772
B. Luas lingkaran = phi × r × r
2772 = 22/7 × r^2
2772 × 7/22 = r^2
882 = r^2
21 akar 2 = r
C. Panjang busur = 60/360 × kell lingkaran = 60/360 × phi × d = 1/6 × 22/7 × 42 akar 2 = 22 akar 2