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Learn how to find the radius or diameter of a circle from its circumference or area.

Learn about resistance and resistivity in this Khan Academy physics lesson.

Khan Academy

Basic Geometry - Khan Academy

Math: Pre-K - 8th grade; Pre-K through grade 2 (Khan Kids) Early math review; 2nd grade; 3rd grade; 4th grade; 5th grade; 6th grade; 7th grade; 8th grade; 3rd grade math (Illustrative Math-aligned)

Learn about gravitational forces, their effects on objects, and how they vary with distance and mass.

Nuestra misión es proporcionar una educación gratuita de clase mundial para cualquier persona en cualquier lugar.

2023年7月25日 · 1. Help teachers get to know their new students. When paired with a table full of crayons or markers, simple questions like “What’s your favorite food?” and “Who’s in your family?” are a great way for teachers to get to know their students.