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A large rectangle is made up of eleven identical rectangles whose longer sides are $$21\text{ cm}$$ long. The perimeter of the large rectangle in $$\text{cm}$$ is
The two horizontal rectangles at the top and bottom each have length $$21\text{ cm}$$, so the large rectangle has width $$42\text{ cm}$$. The seven vertical rectangles across the middle therefore have width $$42\div7=6\text{ cm}$$, making the large height $$21+6+6=33\text{ cm}$$. Thus the perimeter is $$2(42+33)=150\text{ cm}$$.
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