The surface area of a sphere is the number of square units that will exactly cover its surface. The formula for the surface area of a sphere is given by: A = 4r²π where A represents the area and r represents the radius. If you already know the surface area ...

Read More »## Navigating the High School Math Maze

Math is confusing enough without having to deal with lots extra choices. But if you’re a highschooler, there are choices galore. IB, AP Calc, regular Calc, Precalc, Algebra II with Trig, Algebra with Honors, Math Analysis… it all starts to sound like some strange underworld maze that probably has a ...

Read More »## Law of Cosines: How to Use & Practice Examples

We have already seen how to solve triangles using the Law of Sines. Such problems involve two sides and two angles. The Law of Cosines (or the Cosine Rule) is used when we have all three sides involved and only one angle. The formula is: [latex latex size=”3″]c^{2} = a^{2} ...

Read More »## Law of Sines: How to Use & Practice Examples

The Law of Sines (or the Sine Rule) tells us that the ratio of a side length to the sine of its opposite angle is the same for all three sides. As a formula, it looks like this: [latex latex size=”3″]\frac{a}{sin\alpha}=\frac{b}{sin\beta}=\frac{c}{sin\gamma}[/latex] or [latex latex size=”3″]\frac{sin\alpha}{a}=\frac{sin\beta}{b}=\frac{sin\gamma}{c}[/latex] In the formula, a ...

Read More »## SOHCAHTOA

SohCahToa is an acronym which helps you remember how to find the basic trig functions: sine, cosine and tangent. Use SohCahToa with a right triangle only! To check if your triangle is the right triangle, look for the 90-degree angle. It’s the largest one in the triangle and it usually ...

Read More »## Unit Circle: How to Memorize & Use

What is the Unit Circle? The unit circle is a circle, centered at the origin, with a radius of 1. This circle helps us find the exact values of some trigonometric functions and not the decimal approximations the calculator will give us. For example, it’ll help us find the exact ...

Read More »## Unit Circle Chart & Blank Practice Chart (PDF)

Unit Circle Chart & Blank Practice Chart If you’re looking for more information on what the unit circle is and how to memorize/use it, check out our original unit circle post. Here are the PDF’s for the Unit Circle chart as well as a blank chart for practice. You can ...

Read More »## Unit Circle: How to Graph Sine and Cosine Functions

Easy Ways to Graph Sine and Cosine Functions Learn More Liked our video on Sine and Cosine? Check out more lessons in our Trigonometry course at Educator.com. Sine and Cosine Functions Transcript: Let me draw a big unit circle here. That’s a circle of radius 1. Let’s remember where these ...

Read More »## How to Graph Secant and Cosecant Functions

Easy Ways to Graph Secant and Cosecant Functions Learn More Liked our video on Secant and Cosecant? Check out more lessons in our Trigonometry course at Educator.com. Secant and Cosecant Transcript Let’s start with the first example right away. We have to draw a graph of the secant function. In ...

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