Khan Academy: Classifying Shapes by Line and Angles Types

Why was the obtuse angle upset? Because it was never right! A valuable resource is loaded with background information on types of angles and lines. Learners review the characteristics of parallel, perpendicular, and...

In this exercise, students practice classifying shapes by line and angle types. Students receive immediate feedback and have the opportunity to get hints and try questions repeatedly.

Classify shapes based on pictures or attributes, such as angle types and side-lengths. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Lindsay classifies a shape based on hints about its sides and angles.

Demonstrates how to find what 2D shape matches a set of properties. [3:37]

Explains how to classify 2D shapes based on the properties of their sides and angles. [2:15]

Look at the properties of 2D shapes to see which shapes can belong to the same group. Includes hints.

Watch how Sal combines shapes to make other shapes. Includes a video, transcript, and question and answer section. [2:03]

Sal gives compares the attributes of different shapes. Includes a video, transcript, and question and answer section. [6:08]

Sal uses the Khan Academy number line widget.