新SAT官方Daily Practise每日一题数学函数题

小站教育2017-06-26 13:04:42

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摘要:今天起,本系列将给大家带来SAT官方的每日一练真题,各个项目都有,持续更新,希望大家同步多练习。今天这里分享的是6月23日的数学函数题,一起来练习吧!

答案:D

解析:

Recall that there are 2π radians in one revolution of a circle. There are also 360° in one revolution of a circle.

This leads us to the following conversion: 2πradians=360°

If we divide both sides by 360, we have 1°=π/180 radians.

We can use this factor to convert degrees to radians.

The conversion is performed below.

330°=330*1°=330*π/180=11π/6

Alternatively, if we divide both sides of the equation 2π radians=360° by 12, we can conclude that π/6 radians=30°.

Since 330° is 11*30°, its measure in radians must be 11*π/6.

Either way, we have the following: 330°=11π/6.

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