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The figure consists of 4 unit squares. What is the shaded area?

What is the area of the red figure? (All arcs shown are of circles.)

The large triangles are identical. Which is larger, the pink area or the blue area? (All internal triangles are similar to the larger triangles.)

What is the area of the yellow shaded region? (The overall figure is a right triangle.)

In the square below, two semicircles are overlapping. Which is greater: the area shaded blue or the area shaded white?

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