Forbest Academy

免费资源 > SAT-数学 > SAT数学:圆的方程 2

SAT数学:圆的方程 2

2019-09-12 SAT-数学 阅读

SAT Question
Rank: Medium
Topic: Algebra, Geometry, Equation of a Circle

Below is a question from a recent SAT exam. It is a non-calculator question that would typically take a student 1-2 minutes to complete.

A circle in the xy-plane has center (5, 7) and radius 2. Which of the following is an equation of the circle?

(A)
(B)
(C)
(D)

To begin, we will recall the formula for the equation of a circle

Where a is the x-coordinate for the centre of the circle, b is the y-coordinate of the centre of the circle, and r is the radius.
We are told in the question that the circle has a radius of 2. Therefore,
Our equation now looks like this.

Next, we substitute a and b for the values given as the circle's centre.
and

So, the answer is A.

福拜思教育

加拿大校区
  • 地址:401-5811 Cooney Rd, Richmond, BC
  • 地址:3030-8171 Ackroyd Rd, Richmond, BC
  • 客服热线:604-370-0579 & 604-370-2569
  • 联系邮箱:service@forbest.com
中国校区
  • 地址:江苏省无锡市梁溪区清扬路268号三楼
  • 客服热线:181-1861-8855
关注我们
  • 官方公众号
  • 加拿大官方客服
  • 中国官方客服

Copyright 2021 Forbest Academy  福拜思教育

电话咨询 置顶 English
关注我们