Geometry

Khan Academy (X) - Geometry (X)

Volume of Prisms: Volume of a Rectangular Prism - Fractional Cubes

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To find the volume of a rectangular prism, divide it into fractional cubes, find the volume of one cube, then multiply that area by the number of cubes.

Volume of a Rectangular Prism: Fractional Dimensions

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Find the volume of a rectangular prism with fractional dimensions.

Area and Perimeter of Polygons: Finding Area by Rearranging the Parts

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Learn how to rearrange the parts of geometric figures to find the area.

Coordinate Plane: Reflecting Points

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This tutorial explains that a reflection point is the mirror point on the opposite axis--like looking at a mirror image of yourself, but flipped.

Surface Area: Nets of Polyhedra - Introduction

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A polyhedron ("polyhedra" is plural) is nothing more than a 3 dimensional shape with flat surfaces and straight edges. (Think: cube.)

Area and Perimeter of Polygons: Finding Area by Breaking up the Shape

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Find the area of odd-looking geometric figures by breaking the figure up into smaller, simple geometric shapes, then calculate and total their areas.

Surface Area: Using Nets of Polyhedra

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Surface area is the sum of all the areas of all the shapes that cover the object's surface. Let's use the net of polyhedra as an example.

Perimeter and Area of Non-Standard Shapes: Area of a Parallelogram

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What's interesting about the opposite sides of a parallelogram? That's right....they are parallel! Let's find the area--base x height.

Volume of a Rectangular Prism Word Problem: Marbles in a Fish Tank

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Learn how to find the volume of a rectangular prism through a word problem.

Perimeter and Area of Non-Standard Shapes: Area of a Kite

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If you were going to make your own kite out of a piece of cloth, then knowing the area of the kite would be helpful, right?

Area and Perimeter of Polygons: Area of a Strangle Quadrilateral

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Some quadrilaterals are oddly shaped so break it up into shapes for which the area is more easily determined.

Shapes on the Coordinate Plane: Quadrilateral

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In this example we're given the coordinates of the vertices and asked to construct the resulting polygon a quadrilateral). This is fun!

Perimeter and Area: The Basics

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This geometry primer explains the basics of perimeter and area.

Perimeter and Area of Non-Standard Shapes: Area of a Trapezoid

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A trapezoid is a cousin of the parallelogram. However, in a trapezoid only two of the opposing sides are parallel. Here's how to find its area.

Perimeter and Area of Non-Standard Shapes: Quadrilateral Overview

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Learn the definition of quadrilaterals, the difference between concave and convex quadrilaterals, and about trapezoids, parallelograms, and rhombi.

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