CK-12 Foundation
Classifying Angles: Lesson
It's time to put the angles in place. Using diagrams, the video presents the basic definitions of the four classifications of angles. The segment in an informative playlist on basic geometry also provides informal descriptions of the...
Math Antics
Angle Basics
Take a linear approach to acquaint the class with angles. The video introduces the idea of angles from the notion of intersecting lines. Using the idea of perpendicular lines, the resource defines right, acute, and obtuse angles...
Math Antics
Points, Lines and Planes
Geometry begins with a point. The video introduces the concepts of points, lines, and planes. Using diagrams, the presenter includes how to name the objects along with how to write the names. Previewing the concept of 3-D space ends the...
Scholastic
Study Jams! Classify Quadrilaterals
Face the vertex of two-dimensional shapes and discover what each figure requires as part of its classification. With one shape per slide, learners see what makes each shape special and compare it to others with similar qualities.
Scholastic
Study Jams! Types of Lines
Get jamming with lines and sing along to this karaoke that reviews the main types of lines. Your learners can't forget the main properties of lines when they sing the chorus on the karaoke song after the included slide show. The slides...
Corbett Maths
Types of Angle
Angle in on the different types of angles. By watching an informative video, scholars see how to classify angles. It covers acute, right, obtuse, straight, and reflex angles. Some example problems focus on classifying angles given their...
Math Mammoth
Math Mammoth: How to Draw a Right Angle (Perpendicular Line) and a Rectangle
Demonstrates how to draw a right angle and a rectangle. [6:21]
Khan Academy
Khan Academy: Angles, Parallel Lines, & Transversals
Looks at parallel lines and intersecting lines (transversals), and the angles they form. [7:08]
Khan Academy
Khan Academy: Acute, Right, and Obtuse Angles
Explains the properties of acute, right, and obtuse angles. [5:33]
Khan Academy
Khan Academy: Lines, Line Segments, and Rays
Explains the different characteristics of lines, line segments, and rays. [3:38]
Khan Academy
Khan Academy: Classifying Shapes by Lines and Angles
Demonstrates how to find what 2D shape matches a set of properties. [3:37]
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]
Math Mammoth
Math Mammoth: Parallelograms
This video explores the properties of parallelograms. Demonstrates how to measure their lines and angles and how to draw one, and presents drawing problems for students to try on their own. [10:09]
Khan Academy
Khan Academy: Parallel and Perpendicular Lines
Demonstrates how to identify parallel and perpendicular lines in geometric drawings. [3:34]
Math Mammoth
Math Mammoth: Lines, Rays, and Angles
Explains what lines, line segments, rays, and angles are, and how to measure an angle opening. [6:28]
Math Mammoth
Math Mammoth: Acute, Obtuse, and Right Triangles
This lesson goes over the types of triangles. [7:02]
Khan Academy
Khan Academy: Parallel & Perpendicular Lines Intro
Parallel lines never intersect, and perpendicular lines intersect at a 90 degree angle. Learn how to identify parallel and perpendicular lines.
Khan Academy
Khan Academy: Parallel & Perpendicular Lines
Parallel lines are lines in a plane that are always the same distance apart. Parallel lines never intersect. Perpendicular lines are lines that intersect at a right (90 degrees) angle.
Khan Academy
Khan Academy: Drawing Parallel Line Segments
Sal draws parallel line segments with given points.
Khan Academy
Khan Academy: Lines, Line Segments, & Rays
Learn the difference between lines, line segments, and rays.
Khan Academy
Khan Academy: Terms & Labels in Geometry
Learn about geometry terms like point, line, and ray. We will also learn how to label them.
Khan Academy
Khan Academy: Classifying Shapes by Line and Angles Types
Sal categorizes shapes based on their sides and angles.
Khan Academy
Khan Academy: Classifying Shapes by Lines and Angles
Lindsay classifies a shape based on hints about its sides and angles.
Khan Academy
Khan Academy: Recognizing Angles
Sal identifies acute, obtuse, and right angles in diagrams and pictures.