數 - (28) Rectangle 周界 and area

1 ) Rectangle 周界 is 68 cm , 求 biggest area .

2 ) Rectangle area is 432 cm^2 , 求 biggest 周界 .

更新:

hei ,

Are you taking about 1 ) ?

You are WRONG !!!!!!!!!!

更新 2:

This two Rectangle 長闊 must be 整數 .

更新 3:

hei ,

You are right , but can you recorrect 1 ) ?

2 個解答

評分
  • Kin
    Lv 6
    10 年 前
    最佳解答

    1 ) Rectangle 周界 is 68 cm , 求 biggest area .

    The biggest area of rectangle is a square.

    Therefore, the rectangle with biggest area = (68/4)(68/4)=17*17=289cm^2

    2 ) Rectangle area is 432 cm ^2 , 求 biggest 周界 .

    The flatter size of the rectangle, the longer perimeter of it is.

    Taking cm as the smallest unit, the rectangle with longest perimeter = (1 + 432+1+432)= 866cm

  • 10 年 前

    18,16

    18X16=288

    288 cm^2

    2010-06-29 16:26:15 補充:

    432 x 1 =432cm^2

    (432+1) x 2 = 866cm

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