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360 : 12 = 30°
b)15min = ¼h
360°×¼ = 90°
c)1/2 h
360°: 2= 180°
d) 45 min=¾h
360°× ¾ = 270°
1/12 * 360⁰= 30⁰
b) 15min = 1/4h
1/4 * 360⁰ = 90⁰
c) 30min = 1/2h
1/2 * 360⁰ = 120⁰
d) 45min= 3/4h
3/4 * 360⁰ = 270⁰