In this lesson, we are going to talk about triangles and some different ways we can classify them. A triangle is a three-sided polygon. It has three sides, three angles, and three vertices, and you'll see how to label each of these. We can classify triangles in two ways: by their angles and by their sides. Based on the angles of the triangle, we have different names for them: acute (if it has all acute angles), obtuse (one angle is obtuse), and right triangle (one angle is right). You'll also learn about equiangular triangles. Classifying triangles by sides, we have scalene, isosceles, and equilateral triangles. You'll learn how each of these differ.
*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.