In the figure, PQRS is a rectangle. If the shaded area is 72 sq. cm, find h.
From the diagram, PQRS is a rectangle Area of shaded part = 72sq.cm But 72 = 3h - 4 + 6h - 4 + 4h = 72 - 16h - 8 = 16h - 72 + 8 =16h = 80 h = \(\frac{80}{16}\) = 5cm
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