Definitions and undefined terms | Geometry (TX TEKS) | Khan Academy

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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/math/geometry-tx/x790e3ac3e338c450:intro-to-logic/x790e3ac3e338c450:postulates-conjectures-and-theorems/v/definitions-and-undefined-terms Much of geometry depends on building our ideas from foundational pieces. We use definitions to be very clear about what we mean by a right angle, similar figures, or a line segment. If we go to the very base of even those definitions, we have to agree on some ideas, like what we mean by a point or a line, without being able to simply and clearly define them. 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=des

Published 2025-08-26 · Watch on YouTube ↗
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