Since this mirror has a rectangular shape, we can use the formula for the area of a rectangle to calculate the area of this mirror.
The area of any rectangle is equal to the product of the length and width of this rectangle.
According to the condition of the problem, the length of this rectangular mirror is 10 dm, and the width of this mirror is 5 dm, therefore, the area S of this mirror is:
S = 10 * 5 = 50 dm².
Answer: the area of this mirror is 50 dm².
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