平面几何
1.普通几何:
GRE经常考察组和图形,例如两个相等的圆经过对方圆心,求外部周长;一个正三角形中去掉三个以各顶点为圆心,周长一般为半径的圆的以后的部分的面积。 只要熟记下列公式就可以解决:
平面图形的周长和面积:
Perimeter Area
Triangle 三边之和 /2
Square 边长4 边长的平方
Rectangle 2 长宽
Parallelogram 2 底高
Trapezoid 四边之和 高/2
Rhombus 边长4 两条对角线之积的1/2
Circle 2d r2
2.解析几何:
常考的有:
两直线垂直的条件:来直线 和 垂直的条件, 。
平面上两点中点坐标及距离:平面直角坐标系中,A和B是任意两点,C是线段AB的中点,则x=/2,,y=/2,线段AB两端点间的距离=
立体几何
GRE数学中的立体几何只涉及四面体,长方体,正方体,圆柱体,圆锥的面积和体积。
立体图形的表面积和体积
Volume Surface Area
Rectangular Prism 长宽高 2
Cube 棱长的立方 6棱长棱长
Right Circular Cylinder r2h 2r h+ 2r2
Sphere 4r3/3 4r2
Right Circular Cone r2h/3 rl
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