In this lesson we are going to learn about angles. An angle is a figure formed by two non-collinear rays with a common endpoint. That common endpoint is called the vertex. A ray is a segment with one endpoint and one end extending indefinitely. You'll see how opposite rays form a line. You'll learn how to name the angles, and how angles separate a plane into 3 parts. Angles are measured using units called degrees. The number of degrees in the angle is the measure. This lesson also covers some important postulates, like the protractor postulate, and the angle addition postulate. You'll also learn about different types of angles, angle bisectors, and more.
*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.