Become a Geometry Master (Udemy)

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Everything you need to master Geometry. (1) Welcome to Geometry! Introduction Rectangles, area Rectangles, area using sums and differences Rectangles, perimeter Parallelograms, area Trapezoids, area Area Pythagorean theorem Pythagorean theorem, finding perimeter Pythagorean inequalities 45-45-90 30-60-90 Area Circumference Degree measure of an arc Arc length Tangent lines Inscribed angles Vertex on, inside and outside the […]

Geometric constructions (Khan Academy)

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We now have fancy computers to help us perfectly draw things, but have you ever wondered how people drew perfect circles or angle bisectors or perpendicular bisectors back in the day. Well this tutorial will have you doing just as your grandparents did (actually, a little different since you’ll still be using a computer to […]

Analytic geometry (Khan Academy)

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In analytic geometry, also known as coordinate geometry, we think about geometric objects on the coordinate plane. For example, we can see that opposite sides of a parallelogram are parallel by by writing a linear equation for each side and seeing that the slopes are the same. (1) Distance and midpoints Distance between two points […]

Perimeter, area, and volume (Khan Academy)

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A broad set of tutorials covering perimeter area and volume with and without algebra. (1) Basic area Perimeter & area Area of triangles intuition Area of triangles Area of triangles Area of parallelograms intuition Area of parallelograms Area of trapezoids Area of trapezoids Area of kites (2) Advanced perimeter and area Area of a triangle […]

Circles (Khan Academy)

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Explore, prove, and apply important properties of circles that have to do with things like arc length, radians, inscribed angles, and tangents. (1) Circle basics Circles glossary Radius, diameter, circumference & π Proof: all circles are similar (2) Arc measure Intro to arc measure Finding arc measures Arc measure Finding arc measures with equations Arc […]

Right triangles and trigonometry (Khan Academy)

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Triangles are not always right (although they are never wrong), but when they are it opens up an exciting world of possibilities. Not only are right triangles cool in their own right (pun intended), they are the basis of very important ideas in analytic geometry (the distance between two points in space) and trigonometry. (1) […]

Similarity (Khan Academy)

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Learn what it means for two figures to be similar, and how to determine whether two figures are similar or not. Use this concept to prove geometric theorems and solve some problems with polygons. (1) Definitions of similarity Similar shapes & transformations Similarity & transformations Similarity & transformations (advanced) Angles of similar quadrilaterals (2) Introduction […]

Congruence (Khan Academy)

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Learn what it means for two figures to be congruent, and how to determine whether two figures are congruent or not. Use this immensely important concept to prove various geometric theorems about triangles and parallelograms. (1) Transformations and congruence Congruent shapes & transformations Non-congruent shapes & transformations Congruence & transformations Performing sequences of transformations Determining […]

Transformations (Khan Academy)

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In this topic you will learn about the most useful math concept for creating video game graphics: geometric transformations, specifically translations, rotations, reflections, and dilations. You will learn how to perform the transformations, and how to map one figure into another using these transformations. (1) Introduction to rigid transformations Intro to geometric transformations Performing translations […]