1. There are 36 squares that both have the same area,9cm2(平方厘米).If they are arranged to form a big square,find the perimeter of the big square.
2.A swimming pool with length 50m and width 25m was filled with 2500m3(立方米)water.Suddenly,a giant comes and drinks half of water! What is the depth(深度)of water now?
help~
2007-08-21 4:10 am
回答 (2)
2007-08-21 5:35 am
✔ 最佳答案
1.Each side of a small square measures 3cm (square root of 9 cm2)The big square is made up of 6x6 small squares.
Therefore, each side of the big square measures 3cmx6=18cm;
And the perimeter of the big square is 18cmx4=72cm
2.The base area of the swimming pool is 50x25m2=1250m2
When the swimming pool was filled with 2500m3 of water, the depth of water is (2500/1250)m=2m
If the giant drinks half of the water , the depth of the water will become 2/2=1m
2007-08-21 4:24 am
1. 一個small squre既area= 9..
36個就= 9x36=324cm2
正方形既area=一邊自乘...
所以the perimeter of the big squre= 324既開方 = 18cm...
2. the original swimming pool有既水深..= 2500/50/25=2m
因為佢飲左一半..姐係2/2...所以the depth of water now is 1m..
36個就= 9x36=324cm2
正方形既area=一邊自乘...
所以the perimeter of the big squre= 324既開方 = 18cm...
2. the original swimming pool有既水深..= 2500/50/25=2m
因為佢飲左一半..姐係2/2...所以the depth of water now is 1m..
參考: 自己
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