I took an artistic photo. The length of the photo is 90 cm and the width is 40 cm. What is the area of this photo in square centimeters? If you want to make a metal frame for this photo, what is the minimum length of the metal strip?
我照了一张艺术照片，照片长90厘米，宽40厘米，这张照片的面积是多少平方厘米？如果给这张照片做个金属边框，至少需要多长的金属条？
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