SAT数学Problem Solving练习题(4)

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摘要:下面是小站SAT频道为大家整理了SAT数学Problem Solving练习题(1),供考生们参考,以下是详细内容。

以下是小站SAT频道为大家整理了SAT数学Problem Solving练习题(4),供考生们参考,以下是详细内容。

Question #7: A square with the side equal to square root of 2 is inscribed in a circle. What is the area outside the square that is inside the circle?

(a) ¶ + 1

(b) ¶ - 1

(c) ¶ - 2

(d) ¶

(e) ¶ + 2

Answer: The diagonal of the square is √2 · √2 = (√ 2)2 = 2. This is also the diameter of the circle.

The area outside the square and inside the circle is:

Areacircle - Areasquare = ¶ · 22/4 - 2 = ¶ - 2

Question #8: What is the value of (x + 2y) 2 if x 2 + 4 · y 2 = 2 and x · y = 3

(a) 13

(b) 14

(c) 16

(d) 18

(e) 22

Answer: (x + 2y) 2 = x 2 + 4 · y 2 + 4 · x · y = 2 + 12 = 14

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