各位牛哥, 请看
- What is the area of rectangular region R?
1) Each diagonal of R has length 5
2)The perimeter of R is 14
why is C? not A ? 直角三角形的规律 3,4,5. 6,8,10. 5,12,13. ...不可以用在DC里吗?作者: primefang 时间: 2002-8-14 20:07
according to question:
a^2+b^2= 25 , 2a+2b= 14
so if you want the result of ab, both 1 and 2 is needed作者: 愉悦 时间: 2002-8-14 20:27
oh, I see, thank you primefang.
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