As SAT test date is approaching, I practiced both the math and verbal section frequently. A topic in SAT that I learned was the unit circle. This topic is a foundation to the idea of calculus. I’ll be taking pre-calculus class for the rest of the school year so this will be helpful.

A unit circle is a circle with the radius of 1. This circle helps us understand and calculate the angles and lengths of special triangles — 30-60-90 and 45-45-90 triangles. In other words, the unit circle is made up of special triangles.

Below is a drawing I made that explain unit circle.