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一條數學~中二.

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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

最佳解答:

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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