1. Subtract the length of the known side from the semi-perimeter of the rectangle, and obtain the side adjacent to it:
Adjacent side = 22/2 – 6 = 11 – 6 = 5 cm.
2. Find the area of the rectangle by multiplying one adjacent side by the other:
Rectangle area = 6 cm * 5 cm = 11 cm2.
Answer: the area of the rectangle is 11 cm2.
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