30. A picture frame is in the shape of a rectangle.All the measurements are shown in the figure and are correct to the nearest cm.Find the max. and min. areas of the picture frame.
picture frame: 86cm x 58 cm picture: 70cm x 42 cm
一條數學~中二.
2011-10-06 12:43 am
回答 (1)
2011-10-06 2:16 am
✔ 最佳答案
since all the measurements are shown in the figure and are correct to the nearest cm.max. areas of the picture frame
86.4 x 58.4 - 69.5 x 41.5
= 5045.76 - 2884.25
= 2161.51 cm^2
min. areas of the picture frame
85.5 x 57.5 - 70.4 x42.4
= 1931.29 cm^2
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