笨`RIEEE
初生嬰兒
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註冊 2006-11-4
註冊天數 6612
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1. The diameter of a wheel is 0.5 m. How far does it travel in 10 revolutions? { Take π' = 3.14 }
0.5 × 3.14 × 10
﹦1.570796327 × 10
﹦15.70796327
2. A coin rolling along a straight line covers 110 cm in 14 revolutions. Find the diameter of the coin { Take π' = 22/7 }
110 ÷ 14 ÷ 22/7
﹦55/7 × 7/22
﹦5/2
↓超級唔肯定呢***
3. The difference between the radii of two circles is 3 cm. Find the difference in their circumferences. { Express your answer in terms of π }
Let y be the smaller radius, y+3 be the larger radius.
[ ( y ﹢3 ) × 2 × π ] ﹣ ( y × 2 × π )
﹦( 2y ﹢ 6 × π ) - 2πy
﹦2πy ﹢ 6π - 2πy
﹦6π
希望幫到你啦*
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