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62,8 = 2 × 3,14 × r
62,8 = 6,28 × r
r = 62,8 / 6, 28 = 10
11. k = 2 × phi × r
37,68 = 2 × 3,14 × r
37,68 = 6,28 × r
r = 37,68 / 6,28 = 6cm
L = phi × r ^2
L = 3,14 × 6 ×6 = 113,04
16. sudut BOC = 180° - 80° = 100°
Pjng busur BOC = 100 × 24 / 80 = 30 cm