Video guide
Perimeter and area: the basics
Selected because it teaches perimeter and area fundamentals from a recognized educational source. It supplements the geometry calculator's area and perimeter formulas with basic shape reasoning.
Source: Khan Academy · Published 2011-09-30
Open original on YouTubeWhy selected: Selected because it teaches perimeter and area fundamentals from a recognized educational source.
What it adds: It supplements the geometry calculator's area and perimeter formulas with basic shape reasoning.
How to use it: Use the calculator for a selected shape, then use the video to understand which measurement the formula represents.
Open GeometryGeometry: The video is introductory and does not cover every 3D shape, unit-conversion issue, or construction tolerance.
Calculator Suite curates and contextualizes this public lesson but does not own, publish, or endorse every statement in the original video.