SAT数学毕竟是在英文语境下的数学知识和能力的考察,虽然简单,但架不住题量庞大,要做到万无一失而摘取满分,是很难的一件事情。
SAT数学共有四大考点:基本代数:也就是国内初中的线性方程、函数、不等式等。对于高中阶段或者大学阶段申请出国留学的同学来说没有特别的难度,只需要注意一些数学关键词类似initial value, increase/decrease per day, at least, no more than即可。
SAT数学练习
A circle in the xy-plane has a center at (1,-6) and a diameter of 18. Which of the following is the equation of the circle?
坐标轴中,一个圆的圆心在(1,-6),且它的直径为18,求该圆的方程。
A.(x+1)^2+(y-6)^2=324
B.(x+1)^2+(y-6)^2=81
C.(x-1)^2+(y+6)^2=324
D.(x-1)^2+(y+6)^2=81
答案:D
解析:Choice D is correct.
The equation for a circle with a center at (h,k) and a radius of r is:
(x-h)^2+(y-k)^2=r^2
The length of the radius is half of the length of the diameter.
1/2*18 =9
Filling in the coordinates of the center and the length of the radius of this circle results in the equation:
(x-1)^2+(y-(-6))^2=9^2
In standard form, the equation of this circle is: (x-1)^2+(y+6)^2=81
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