An angle is formed when two rays share the same endpoint, which is called the vertex of the angle. In geometric notation, the vertex is the middle letter in the name of the angle. Each angle has a degree value, which is the measurement of the size of the angle, and the degree value [...]

For the ISEE and other standardized tests with math sections, estimation is your friend. Estimation will reduce the amount of time you spend making calculations, which allows more time to complete difficult questions. Estimation is rounding a number up or down to make it easier to calculate, but the estimated number must be as [...]

Geometry is the branch of mathematics that encompasses the properties and relationships of shapes, such as points, angles, and solid figures. Like every other branch of mathematics, Geometry comes with its own set of notations. Types of Angles  An angle is formed when two rays share the same endpoint, which is called the vertex [...]

Now, graphing a linear inequality is very similar to graphing a linear equation, since you follow all the same rules for slope and the y‐intercept. However, the graph will look different. A linear equation has one input resulting in one output, while a linear inequality has one input resulting in many outputs. Essentially, the [...]

Triangles are those handy‐dandy three‐sided polygons with which mathematicians have done so much work, particularly the right triangle. The most important thing to remember about all triangles is that the sum of their interior angles is 180°. Again, the sum of the interior angles of any triangle is 180°. Once more, the sum of [...]