功課唔識作-.-

2007-04-15 3:49 am
圓的半徑is20cm,分成8分,每個的周界is多少cm?

回答 (3)

2007-04-15 3:57 am
✔ 最佳答案
20x2x3.14除以8+20x2=55.7(cm)

圓的周界:

20x2x3.14
=40x3.14
=125.6(cm)

分成8等份:

125.6除以8
=15.7(cm)

每個的周界是:

15.7+20x2
=15.7+40
=55.7(cm)

2007-04-14 19:59:16 補充:
I can promise you my answer is correct !!!!
參考: Myself
2007-04-15 4:00 am
圓周公式 = 2πr
所以: 2 x π x 20 = 125.66
因為圓形被分為8分, 所以 125.66 除以 8 = 15.71
1/8 個圓周 再加兩條半徑的長 = 15.71 +20+20 = 55.71cm
2007-04-15 3:54 am
100 cm


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