A rectangle has a length of (3.2a 1 0.18b) centimeters. The width is half the length. Sasha writes the expression (12.8a 1 0.72b) to represent the perimeter of the rectangle in centimeters. Is Sasha’s reasoning correct? Explain.
Question
Answer:
Perimeter of the rectangle will be given by:P=2(L+W)
L=(3.2a 10.18b)
W=1/2(3.2a 10.18b)=(1.6a 5.9b)
Thus the perimeter will be:
P=2(3.2a 10.18b+1.6a 5.9b)
P=2(4.8a 16.08b)
P=(9.6a+ 32.16b)
Sasha was not correct
solved
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