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  1. Basic Geometry | Khan Academy

    Unit 4: Plane figures Unit mastery: 0% Quadrilaterals introduction Classifying triangles Parallel and perpendicular Classifying geometric shapes Lines of symmetry More on quadrilaterals …

  2. Geometry (all content) | Khan Academy

    Unit 16: Geometric constructions Constructing bisectors of lines and angles Constructing regular polygons inscribed in circles Constructing circumcircles and incircles Constructing a line …

  3. Shapes | Geometry (all content) | Math | Khan Academy

    Identify your areas for growth in these lessons: Curves and polygons Angles with polygons Geometric solids (3D shapes) Start quiz

  4. Intro to geometric sequences (advanced) - Khan Academy

    Let's talk about geometric sequences, which is a class of sequences where we start at some number, then each successive number is the previous number multiplied by the same thing.

  5. Geometric sequences review - Khan Academy

    Parts and formulas of geometric sequence In geometric sequences, the ratio between consecutive terms is always the same. We call that ratio the common ratio. For example, the …

  6. Intro to geometric sequences (video) | Khan Academy

    In this video I want to introduce you to the idea of a geometric sequence. And I have a ton of more advanced videos on the topic, but it's really a good place to start, just to understand what …

  7. Get ready for Geometry | Math | Khan Academy

    Unit 4: Get ready for circles and solid geometry Unit mastery: 0% Area and circumference of circles Slicing geometric shapes Volume and surface area word problems Volume of cylinders, …

  8. High school geometry - Khan Academy

    Learn high school geometry—transformations, congruence, similarity, trigonometry, analytic geometry, and more (aligned with Common Core standards).

  9. Geometric constructions | Geometry (all content) - Khan Academy

    Unit 16: Geometric constructions About this unit We now have fancy computers to help us perfectly draw things, but have you ever wondered how people drew perfect circles or angle …

  10. Use geometric sequence formulas (practice) | Khan Academy

    Given the formula of a geometric sequence, either in explicit form or in recursive form, find a specific term in the sequence.