Relating side lengths and areas of squares | 8th grade math (IM® v.360 aligned) | Khan Academy

"Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now!
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-8-pythagorean-theorem-and-irrational-numbers/lesson-2-side-lengths-and-areas/v/relating-side-lengths-and-areas-of-squares

Introduce square roots as the side length of a square with a given area. Estimate a square's side length by comparing it to squares with known, nearby areas.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Donate or volunteer today! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc"
...
https://www.youtube.com/watch?v=G7uDwEvu_Wk
Note: All Khan Academy content is available for free at (www.khanacademy.org)