SAT数学Problem Solving练习题(20)

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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(20),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(20),供考生们参考,以下是详细内容。

Question 20: Two diameters of a circle create an angle AOB of 45o between them. What is the length of arc AB if the radius of the circle is 10/¶?

SAT数学Problem Solving练习题(3)

(a) 5/2

(b) 3/2

(c) 2

(d) 4

(e) 6

Answer: The circumference of the circle is 2·¶·r = 2·¶·10/¶ = 20.

The ratio between the length of arc AB and the circumference of the circle is equal between the ratio between the 45o angle and 360o.

In conclusion, AB = 20 · 45o/360o = 20/8 = 5/2.

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