F.2 maths

2014-05-13 7:29 pm

The figure consists of a square and a semi-circle. It is given that the height of the figure is 12 cm. Find the radius of the semi circle.

回答 (2)

2014-05-13 11:52 pm
✔ 最佳答案
The figure我估是咁的
  _____
 /    \ ^
 |___半圓_| |
 |     | | 12cm
 | 正方  | |
 |________| -

望住:
  _____
 /    \ ^ 個圓形頂到圓心=r
 |________| |
->半圓同正方形連住果條
呢條係直徑=2r

姐係:
2r 同時係正方形既邊長

所以:
12cm= 半圓r + 正方形邊長 2r

因此:
12= 3r
r= ? 係自己計啦
參考: 早兩日同f2補數做完
2014-05-13 8:41 pm
The figure...

2014-05-13 15:29:36 補充:
http://postimg.org/image/lq3daiarn/

似唔似上面網址哥個??


收錄日期: 2021-04-13 22:18:34
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