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Geometry

24167 min24part Geometry course96 CQ
Having trouble in geometry class? Reviewing for the SATs? This course from Math Fortress explains the principles of geometry, from segments, intersections, and degrees to angles and congruence.
with Math FortressHaving trouble in geometry class? Reviewing for the SATs? This course from Math Fortress explains the principles of geometry, from segments, intersections, and degrees to angles and congruence.


6 minGeometry lesson4 CQ
Follow along to three examples that illustrate how to use previously proven theorems, assumptions, and properties in order to write a geometric proof.
with Math FortressFollow along to three examples that illustrate how to use previously proven theorems, assumptions, and properties in order to write a geometric proof.

6 minGeometry lesson4 CQ
The math problem covered in this lesson appeared in an MIT admission test in the year 1869, and is a good test of geometry concepts. Give it a try!
with Sanjay NoronhaThe math problem covered in this lesson appeared in an MIT admission test in the year 1869, and is a good test of geometry concepts. Give it a try!

6 minGeometry lesson4 CQ
In this lesson, Math Fortress presents and proves two basic theorems in geometry, the right angles theorem and the straight angles theorem.
with Math FortressIn this lesson, Math Fortress presents and proves two basic theorems in geometry, the right angles theorem and the straight angles theorem.

9 minAlgebra lesson5 CQ
This lesson explains the basics of how to write twocolumn algebraic and geometric proofs. It also covers the elements of an axiomatic system. Let's dig in!
with Math FortressThis lesson explains the basics of how to write twocolumn algebraic and geometric proofs. It also covers the elements of an axiomatic system. Let's dig in!

3 minFREEGeometry Nerdy CurioFree2 CQ
As we kick off a new year, let us ponder our we've "shaped" our world. A Nerdy Curio all about flat surfaces, stability, and the power of three.
As we kick off a new year, let us ponder our we've "shaped" our world. A Nerdy Curio all about flat surfaces, stability, and the power of three.

2 minFREEGeometry lessonFree2 CQ
In this lesson, a young learner helps kids understand a foundational mathematical concept—how to solve for the hypotenuse of a right angle triangle!
with Sanjay NoronhaIn this lesson, a young learner helps kids understand a foundational mathematical concept—how to solve for the hypotenuse of a right angle triangle!

19 minFREEAlgebra lessonFree10 CQ
The Pythagorean theorem is one of the most important ideas in geometry. Learn to use Pythagoras’ theorem to solve triangles, diagonals, and more!
with Me vs MathsThe Pythagorean theorem is one of the most important ideas in geometry. Learn to use Pythagoras’ theorem to solve triangles, diagonals, and more!

5 minFREEGeometry lessonFree3 CQ
Want to know how to find the shortest distance from a point to a line? Math teacher Al Richards demonstrates how using analytic geometry and trigonometry.
with Al RichardsWant to know how to find the shortest distance from a point to a line? Math teacher Al Richards demonstrates how using analytic geometry and trigonometry.
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325 min3part Biology course14 CQ
Preparing for the AP Biology exam? In this threepart course, get clear explanations of Darwinian evolution by natural selection, modern evolutionary theory, and the history of life on Earth.
with Bleier BiologyPreparing for the AP Biology exam? In this threepart course, get clear explanations of Darwinian evolution by natural selection, modern evolutionary theory, and the history of life on Earth.

7107 min7part iOS Development course57 CQ
Looking for a programming language that can do some heavylifting but doesn't take years to master? When programming for iOS, OS X, and watchOS, Apple's programming language Swift is the best choice!
with Sanjay NoronhaLooking for a programming language that can do some heavylifting but doesn't take years to master? When programming for iOS, OS X, and watchOS, Apple's programming language Swift is the best choice!

11163 min11part iPhones + iPads course88 CQ
Want to get the most out of your iPhone? This course from tech expert Todd Olthoff is the perfect guide, for everything from basic installation to builtin app features.
with Todd OlthoffWant to get the most out of your iPhone? This course from tech expert Todd Olthoff is the perfect guide, for everything from basic installation to builtin app features.

41572 min41part Arduino course303 CQ
Want to build a new robot friend? How about create a cool LED sign? Whatever the gadget may be, get started with this beginnerfriendly Arduino course from Open Source Hardware!
Want to build a new robot friend? How about create a cool LED sign? Whatever the gadget may be, get started with this beginnerfriendly Arduino course from Open Source Hardware!

1270 min12part Science course41 CQ
If you're looking for fun activities for kids that are equal parts science and craft, you'll love this course with lessons covering everything from homemade oobleck to egghead gardens.
with Sophie's WorldIf you're looking for fun activities for kids that are equal parts science and craft, you'll love this course with lessons covering everything from homemade oobleck to egghead gardens.

872 min8part Astronomy course39 CQ
If you observe the night sky, do you know what's up there? Stars, galaxies, constellations, and more! In this stargazing course for beginners, learn to find and identify celestial bodies.
with Rod MillerIf you observe the night sky, do you know what's up there? Stars, galaxies, constellations, and more! In this stargazing course for beginners, learn to find and identify celestial bodies.

1199 min11part Science course56 CQ
Take a road trip through the cosmos and explore galaxies! Astrophysicist Sebastian Pines explains the science behind these gravitationally bound systems, from black holes to nebulae.
with AstronomicTake a road trip through the cosmos and explore galaxies! Astrophysicist Sebastian Pines explains the science behind these gravitationally bound systems, from black holes to nebulae.

1152 min11part Science course33 CQ
When you look up into the sky, do you ever wonder about the other planets that orbit around the Sun? This course explores our Solar System, from Mercury to the distant ice giants.
with AstronomicWhen you look up into the sky, do you ever wonder about the other planets that orbit around the Sun? This course explores our Solar System, from Mercury to the distant ice giants.

2 minFREEAstronomy Nerdy CurioFree2 CQ
Learn what to look for in the night sky with today’s Nerdy Curio from Stardate. For many people, one of the most common sights in the night sky is also one o...
with StardateLearn what to look for in the night sky with today’s Nerdy Curio from Stardate. For many people, one of the most common sights in the night sky is also one o...