NUMBEROCK
Angles
Which type angle is the cutest? Which looks like the antlers on the head of a FULL-GROWN moose?! Find out the answers to these mysterious questions as Earl, our favorite pizza delivery man, takes us on his route for a day to show us...
Curated Video
Classify Quadrilaterals by Examining Their Sides
In this video, students will learn how to determine the relationship between quadrilaterals by examining their sides. The video explains the concepts of regular and irregular polygons, as well as the importance of considering the number...
Getty Images
SLR Camera Viewfinder
Camera viewfinder simulation with alpha matte suitable as a video footage overlay.
Khan Academy
Acute Right and Obtuse Angles, Angles and Intersecting Lines, Geometry
This resource highlights the basics of working with angles and could provide a sound introductory activity for students who are beginning to learn about angles. Eager mathematicians will be introduced to the terminology associated with...
Khan Academy
Khan Academy: Geometry: Measuring Angles in Degrees
Explains how to measure an angle in degrees using a protractor. Defines acute, right, and obtuse angles. Practice problems available. [8:22]
Khan Academy
Khan Academy: Geometry: Acute, Obtuse, and Right Angles
Demonstrates how to find all acute, obtuse, and right angles in a given diagram. [6:35]
Khan Academy
Khan Academy: Measuring Angles in Degrees
Explains what a protractor is and how it is used to measure the size of angles. Also discusses the different types of angles. [8:23]
CK-12 Foundation
Ck 12: Elem Math: Overview of Classification of Angles
[Free Registration/Login may be required to access all resource tools.] Video describing four types of angles - right, acute, obtuse and straight. [1:19]
Sophia Learning
Sophia: Classifying Triangles
This video lesson describes and provides examples of right, acute, and obtuse triangles. Students can check their understanding with an assessment. [2:24]
Khan Academy
Khan Academy: Recognizing Angles
Demonstrates how to solve problems that ask you to identify types of angles. [2:15]
Shmoop University
Shmoop: Angles
This video discusses angles in an original, cute manner, illustrating different types of angles with animated characters.