Any triangle, such as △COD in the figure above, formed by connecting the endpoints of two radii is isosceles.
Radius半径复数是radii
我们从初中初步就进修圆的常识, 作为一位中国门生,大师能够再熟悉不外了。那末怎样将SAT数学中的圆战争常数学中的圆相结合在一路就是一个题目。提起圆的周长、面积,教员给大师整理了关于圆的纪律分享。为了援助考生更好的进修SAT考试中的数学
Centralangle中心角
肆意一个三角形,由圆心到圆上肆意两点的毗连组成的都是等腰三角形
那末d=2r, 假如d是直径
Semicircle半圆
π= circumference/diameter =C/d or C = πd or C = 2πr
纪律4:The formula for the area of a circle of radius r is A = πr 2.
Diameter直径
Circumference圆周长
Tangent切线
Arc弧度
一个圆是由从同一个点动身的间隔相称的点组合而成,这段间隔叫做半径
纪律1:If d is the diameter and r the radius of a circle, then d = 2r.
Inscribed内接于
纪律2:A diameter is the longest line segment that can be drawn in a circle.
在一个圆中最长的线段就是直径
A circle consists of all the points that are the same distance from one fixed point, called the center. That distance is called the radius
首先我们来看SAT数学中对于圆的考核内容:
纪律5:A line tangent to a circle is perpendicular to the radius drawn to the point of contact.一个圆切线与切点到圆心的半径是垂直的。
来对这些常识点和纪律加以应用才华独霸,圆的常识点和纪律底子就是这么多了,盼望大师能考到一个良好的数学分数。更多SAT内容请关注灵格斯教导SAT考试频道。, 以上就是为大师整理的SAT数学关于圆的进修,考生接下来要停止相关的练习
对于每一个圆形:
纪律3:The degree measure of an arc equals the degree measure of the central angle that intercepts it.
If an arc measures x°, the length of the arc is X/360*(2πr); and the area of the sector formed by the arc and two radii is X/360 *(πr2).
一个弧度的度数与其对应中心角的度数是相称的。
一个圆的面积公式是A = πr 2(r是半径).
Circle 圆的界说: