Khan Academy on a Stick
Perimeter, area and volume
A broad set of tutorials covering perimeter area and volume with and without algebra.

Perimeter and Area Basics
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Area and Perimeter
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Area of rectangles and triangles. Perimeter of rectangles.

Perimeter of a Polygon
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Perimeter and area of rectangles
How long of a fence do you need? How big is your house? How big is your waistline? What's your hat size? These are fundamentally important questions that need to be answered! This is a tutorial to give you the basics of what perimeter, circumference (really the perimeter of a circle) and area are and then applies the ideas to triangles, rectangles and circles. This is more of review for students who are going through the main geometry narrative and can be skipped if yo u remember it from gradeschool.

Perimeter and Area Basics
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Triangle Area Proofs
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Proving that the area of any triangle is 1/2 b x h

Interesting Perimeter and Area Problems
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Three example problems involving perimeter and area

Area of Diagonal Generated Triangles of Rectangle are Equal
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Area of Diagonal Generated Triangles of Rectangle are Equal

Area of an equilateral triangle
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Finding the formula for the area of an equilateral triangle with side s
 Area of shaded region made from equilateral triangles

Challenging Perimeter Problem
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Perimeter of rectangle covered by 9 nonoverlapping squares. From 200) American Invitational Math Exam
Perimeter and area of triangles
You first learned about perimeter and area when you were in grade school. In this tutorial, we will revisit those ideas with a more mathy lense. We will use our prior knowledge of congruence to really start to prove some neat (and useful) results (including some that will be useful in our study of similarity).

Triangle inqequality theorem
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Intuition behind the triangle inequality theorem
Triangle inequality theorem
The triangle inequality theorem is, on some level, kind of simple. But, as you'll see as you go into high level mathematics, it is often used in fancy proofs. This tutorial introduces you to what it is and gives you some practice understanding the constraints on the dimensions of a triangle.

Koch Snowflake Fractal
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A shape that has an infinite perimeter but finite area

Area of an equilateral triangle
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Finding the formula for the area of an equilateral triangle with side s

Area of Koch Snowflake (part 1)  Advanced
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Starting to figure out the area of a Koch Snowflake (which has an infinite perimeter)

Area of Koch Snowflake (part 2)  Advanced
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Summing an infinite geometric series to finally find the finite area of a Koch Snowflake
Koch snowflake fractal
Named after Helge von Koch, the Koch snowflake is one of the first fractals to be discovered. It is created by adding smaller and smaller equilateral bumps to an existing equilateral triangle. Quite amazingly, it produces a figure of infinite perimeter and finite area!

Heron's Formula
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Using Heron's Formula to determine the area of a triangle while only knowing the lengths of the sides

Part 1 of Proof of Heron's Formula
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Part 1 of the proof of Heron's Formula

Part 2 of the Proof of Heron's Formula
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Showing that the expression in part 1 is identical to Heron's Formula
Heron's formula
Named after Heron of Alexandria, Heron's formula is a power (but often overlooked) method for finding the area of ANY triangle. In this tutorial we will explain how to use it and then prove it!

Circles: Radius, Diameter and Circumference
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Understanding the relationship between the radius diameter and circumference of a circle.

Parts of a Circle
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Parts of a Circle

Area of a Circle
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Area of a Circle
Circumference and area of circles
Circles are everywhere. How can we measure how big they are? Well, we could think about the distance around the circle (circumference). Another option would be to think about how much space it takes up on our paper (area). Have fun!

Quadrilateral Overview
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Basics of quadrilaterals including concave, convex ones. Parallelograms, rectangles, rhombi and squares

Quadrilateral Properties
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Quadrilateral Properties

Area of a Parallelogram
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Showing that the area of a parallelogram is base times height
 Area of a trapezoid
 Area of a kite

Perimeter of a Polygon
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Perimeter and Area of a NonStandard Polygon
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Perimeter and Area of a NonStandard Polygon
Perimeter and area of nonstandard shapes
Not everything in the world is a rectangle, circle or triangle. In this tutorial, we give you practice at finding the perimeters and areas of these lessthanstandard shapes!

Solid Geometry Volume
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Volume of triangular prisms and cubes

Cylinder Volume and Surface Area
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Finding the volume and surface area of a cylinder

Volume of a Sphere
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Volume of a Sphere
Volume and surface area
Tired of perimeter and area and now want to measure 3D spacetakeupness. Well you've found the right tutorial. Enjoy!