Today in class students learned that while the scale factor is multiplied by all of the sides of a figure to create a scaled copy, to find the area of the new copy....you have to square the scale factor and multiply it with the original area.
Answers to HW: 1. The perimeter of Q is 20 units, and the area of Q is 16 units. The scaled copy perimeter is 40 units, and the area of the copy is 64 square units. The scale factor is 2 and the area is multiplied by the square of the scale factor. 2. The area of each scaled triangle is the area of the original times the square of the scale factor scale factor area (units squared) 1 36 2 144 3 324 5 900 1/2 9 2/3 16 3. Diego used the scale factor of 1/4. The area of Q is 4.5 square units. This area is 1/16 the area of P (1/4)(1/4). 4. a. 1/2 because the vertical side on the copy is 1/2 the length of the vertical side on the original b. 2 because the vertical side on the copy is twice the length of the vertical side of the original c. 3/2 because the vertical side on the copy is 3/2 the length of the vertical side on the original d. 1 because the original and the copy have the same size 5. a. x = 7 b. x = 11 c. x = 5
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