How to read graphs - SSAT Upper Level: Quantitative

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Question

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The above figure shows two black quarter-circles inscribed inside a rectangle. If the black region has area 200, what is the area of the white region (nearest tenth)?

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Answer

If the radius of each quarter-circle is , the black region has area

Set and solve for :

The area of the rectangle, which we will call , is

The area of the white region is the difference of these two areas, or

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