Khan Academy
Khan Academy: Area of a Circle
Models how to calculate the area of a circle when the diameter is known. [4:02]
Loyola University Chicago
Math Flix: Congruency
This QuickTime movie provides an opportunity to learn about the basic geometric term congruency. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.
Math TV
Math tv.com: Trigonometry: Right Triangle Trigonometry
Students review right triangle trigonometry. The resource consists of a worksheet with practice problems and solutions. In the left hand menu, click Trigonometry, Right Triangle Trigonometry.
Virtual Nerd
Virtual Nerd: Construct Equilateral Triangle and Square Inscribed in a Circle
Two videos on geometric constructions. One explains how to construct an equilateral triangle using a ruler and compass. The second describes how to draw a square using a compass and a straightedge.
Khan Academy
Khan Academy: Angles, Parallel Lines, & Transversals
Looks at parallel lines and intersecting lines (transversals), and the angles they form. [7:08]
Khan Academy
Khan Academy: Recognizing Shapes
Discusses how to identify basic 2D shapes by their properties. [6:08]
Khan Academy
Khan Academy: Cousin Fal's Shape Collection
Looks at a collection of 2D shapes and discusses how to identify them based on their properties. [4:19]
Khan Academy
Khan Academy: Intro to Nets of Polyhedra
Learn about the nets that represent 3D solids. [6:48]
Khan Academy
Khan Academy: Recognizing Shapes
Learn the names of different shapes and how to recognize them. [6:08]
Khan Academy
Khan Academy: Find Measure of Angles Word Problem
Presents a problem where pie slices are measured in degrees and you must find the angle of your piece. [4:33]
Khan Academy
Khan Academy: Find Measure of Vertical Angles
Demonstrates how to find unknown angles for two intersecting lines when some angle information is given. [3:00]
Khan Academy
Khan Academy: Equal Parts of Circles and Rectangles
Looks at circles and rectangles that are divided into sections and discusses how to tell if they are in equal parts of halves or fourths. [3:04]
Khan Academy
Khan Academy: Triangle Inequality Theorem
Explains the Triangle Inequality Theorem, which states that the sum of two sides of a triangle is always more than the length of the third side. [5:52]
Khan Academy
Khan Academy: Slicing a Rectangular Pyramid
Demonstrates what types of shapes one can get in a cross-section when a rectangular pyramid is sliced. [3:29]
Virtual Nerd
Virtual Nerd: What Is a Transformation?
Transformations allow you to change or move a figure. Learn about all the different kinds of transformations by watching this tutorial. [4:18]
Virtual Nerd
Virtual Nerd: What Is a Tessellation?
You have probably seen tons of tessellations before without even knowing what they are. Learn about tessellations and see some of their interesting qualities by watching this tutorial. [5:00]
Virtual Nerd
Virtual Nerd: What Is a Line of Reflection?
The line you reflect a figure over is called the line of reflection. Watch this tutorial and learn about the line of reflection. [3:14]
Virtual Nerd
Virtual Nerd: What Is an Image?
When you're dealing with transformations, the new figure you get is called an image. Take a look at this tutorial and learn about images. [3:39]
Virtual Nerd
Virtual Nerd: What Does Congruent Mean?
Video tutorial explores the term congruent which is often used to describe figures that have the same size and shape. [5:21]
Virtual Nerd
Virtual Nerd: What Is a Triangle?
This tutorial explains triangles and their different types. [5:58]
Virtual Nerd
Virtual Nerd: What Is a Degree?
Watch this tutorial to learn what a degree is and how it relates to a circle. [3:08]
Virtual Nerd
Virtual Nerd: What Are Intersecting Lines?
Two lines that cut across one another are called intersecting lines. Learn about them by watching this tutorial. [7:19]
Virtual Nerd
Virtual Nerd: How Do You Classify Triangles?
If you know what kind of triangle you're looking at, it's much easier to figure out how to solve for various sides and angles. Use this tutorial to practice classifying triangles. [7:15]
Virtual Nerd
Virtual Nerd: How Do You Find a Missing Angle in a Triangle?
It's important to remember that the interior angles of a triangle always add up to 180 degrees. This tutorial shows you how to put this knowledge into an equation and solve to find a missing measurement. [4:22]
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