Sarah asked in 科學及數學數學 · 9 years ago

一條數學~中二.

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

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  • 9 years ago
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    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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