✔ 最佳答案
知識長....太複雜啦
2014-11-06 17:10:13 補充:
圓周率當3.14 小六數學
2014-11-06 17:32:16 補充:
1. 4*4*3.14*90/360=4*4*3.14*1/4=12.56 1: 12.56 cm^2
2. 10*10*3.14*90/360=78.5 2: 78.5 cm^2
3. 6*6*3.14*120/360=6*6*3.14*1/3=37.68 3. 37.68cm^2
4. 8*8*3.14/(2*2*2)=8*3.14=25.12 4. 25.12cm^2
5. 6*6*3.14*7/12=3.14*21=65.94 5. 65.94cm^2
6. 10*10*3.14*72/360=62.8 6. 62.8cm^2
7. 60*96/360*3.14=50.24 7. 50.24cm
8. 10*3.14=31.4 8. 31.4cm
9. (18+10)*3.14=87.92 9 .87.92cm
10. 10*3.14=31.4 10. 31.4cm
11. 2/(3+5+8)*3.14=25.12 11. 25.12cm
12. (6+8)*3.14=43.96 43.96/2=21.98
21.98+2=23.98 12.23.98cm