Triangles | Geometry (all content) | Math | Khan Academy
This webpage provides resources and lessons on triangle properties in geometry.
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Geometry (all content) - Khan Academy
Learn geometry—angles, shapes, transformations, proofs, and more. Skip to main content If you're seeing this message, it means we're having trouble loading external resources on our website.
Right triangles & trigonometry | Math | Khan Academy
Can you find the length of a missing side of a right triangle? You most likely can: if you are given two side lengths you can use the Pythagorean Theorem to find the third one. But, what if you are only given one side? Impossible? Cue sine, cosine, and tangent, which will help you solve for any side or any angle of a right triangle.
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Review of triangle angles, including interior and exterior angles, and their properties.
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Learn about angles in geometry with Khan Academy's free online resources.
Basic Geometry - Khan Academy
This Basic geometry and measurement course is a refresher of length, area, perimeter, volume, angle measure, and transformations of 2D and 3D figures. If you are learning the content for the first time, consider using the grade-level courses for more in-depth instruction.
Triangle medians & centroids - Khan Academy
The centroid of a triangle is the point at which the three medians intersect. To locate the centroid, draw each of the three medians (which connect the vertices of the triangle to the midpoints of the opposite sides).
Area and perimeter | Geometry (all content) | Math - Khan Academy
Area and perimeter help us measure the size of 2D shapes. We’ll start with the area and perimeter of rectangles. From there, we’ll tackle trickier shapes, such as triangles and circles.
Unit 8: Equations and geometry - Khan Academy
Equations and geometry: Unit test Our mission is to provide a free, world-class education to anyone, anywhere. Khan Academy is a 501(c)(3) nonprofit organization.