Proving that a point is the midpoint via triangle congruency Watch the next lesson: https://www.khanacademy.org/math/geometry/congruent-triangles/cong_triangle/v/congruent-triangle-example-2?utm_source=YT&utm_medium=Desc&utm_campaign=Geometry Missed the previous lesson? https://www.khanacademy.org/math/geometry/congruent-triangles/cong_triangle/v/perpendicular-radius-bisects-chord?utm_source=YT&utm_medium=Desc&utm_campaign=Geometry Geometry on Khan Academy: We are surrounded by space. And that space contains lots of things. And these things have shapes. In geometry we are concerned with the nature of these shapes, how we define them, and what they teach us about the world at large--from math to architecture to biology to astronomy (and everything in between). Learning geometry is about more than just taking your medicine ("It's good for you!"), it's at the core of everything that exists--including you. Having said all that, some of the specific topics we'll cover include angles, intersecting lines, right triangles, perimeter, area, volume, circles, triangles, quadrilaterals, analytic geometry, and geometric constructions. Wow. That's a lot. To summarize: it's difficult to imagine any area of math that is more widely used than geometry. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. ... https://www.youtube.com/watch?v=RFesGHsuFZw Note: All Khan Academy content is available for free at (www.khanacademy.org)

... https://www.youtube.com/watch?v=CBJ3_A5SMsc Note: All Khan Academy content is available for free at (www.khanacademy.org)

Thinking about sweat on a molecular level ... https://www.youtube.com/watch?v=gLYLGT-VrxE Note: All Khan Academy content is available for free at (www.khanacademy.org)

CAHSEE Practice: Problems 52-53. Created by Sal Khan. This is the last video in our CAHSEE subject! Now move on to our first video in AP Art Histroy: https://www.khanacademy.org/humanities/art-history-basics/beginners-art-history/v/why-look-at-art?utm_source=YT&utm_medium=Desc&utm_campaign=APAryHistory Missed the previous lesson? https://www.khanacademy.org/test-prep/cahsee-subject/cahsee/v/cahsee-practice-problems-47-51?utm_source=YT&utm_medium=Desc&utm_campaign=CAHSEE CAHSEE on Khan Academy: Sal working through the 53 problems from the practice test available at http://www.cde.ca.gov/ta/tg/hs/documents/mathpractest.pdf for the CAHSEE (California High School Exit Examination). Clearly useful if you're looking to take that exam. Probably still useful if you want to make sure you have a solid understanding of basic high school math. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. ... https://www.youtube.com/watch?v=FdD0Wu032R4 Note: All Khan Academy content is available for free at (www.khanacademy.org)