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rectangle A measures 30 inches by 21 inches. rectangle B is a scale of copy of rectangle A. what is the measure of the lenght of the side that is missing in rectangle B?​

rectangle A measures 30 inches by 21 inches rectangle B is a scale of copy of rectangle A what is the measure of the lenght of the side that is missing in recta class=
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Answer:

7 inches

Step-by-step explanation:

First, you must find out how many times bigger rectangle A is than rectangle B. We can write this as 30 ÷ s = 10. We can easily see that s = 3, so A has to be 3 times bigger than B. To find the missing side, divide 21 by 3:

21 ÷ 3 = 7 inches

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