A point is an exact location in space. This tutorial defines the concept of a point as it occurs in graphing, geometry, and algebra. A variety of examples are used to show how important points are and where they'll be seen in the world...

It's a bird, it's a plane, it's Superman. No, it's really a plane. A plane is named by identifying three points with the exception that they do not form a straight line. A plane can also be identified by a single letter naming it. The...

Two figures are congruent if they have the same size and shape. Line segments can also be congruent if they are of the same length. Vertical angles created by intersecting lines are always congruent. Polygons that have matching angles...

Face the vertex of two-dimensional shapes and discover what each figure requires as part of its classification. With one shape per slide, learners see what makes each shape special and compare it to others with similar qualities. 

Place angles in a line. Part of a playlist on basic geometry, an informative video teaches pupils the definition of a linear pair and how to identify them. Using their properties, the resource demonstrates how to solve problems involving...

Find the location of altitudes—from any elevation! The video presents the definition of an altitude of a triangle. By drawing examples, the segment of a larger geometry playlist highlights the location of altitudes of various triangle...

Learners use inductive reasoning every day but might not realize it. An instructive video demonstrates that the process of inductive reasoning means searching for and identifying patterns. The instructor begins with numeric...

Fascinating discussion regarding the origin of Pi accompanies a detailed explanation of how to find the circumference of a circle. Since this is the first installment in a series on circles, the concept of circumference is separated into...

This video answers the question, What is an ellipse? It gives a definition of an ellipse, shows the ellipses relation of a plane to a cone, and the names of different parts of the ellipse.

Identifies which angles are congruent when parallel lines are cut by a transversal. [7:07]

In this video lesson [11:14], the instructor demonstrates solutions to problems #21-25 of California Geometry released state test questions. Problems address understanding of the triangle inequality theorem, angle relationships with...

Video lesson explains angles, lines, and transversals. [9:33]

Discover the difference between perpendicular lines and intersecting lines. Assess understanding with a quiz.

Proof that a point on the angle bisector is equidistant from each side of the angle and proof that a point that is equidistant from each side of the angle lies on the angle bisector. [10:57]

The angles formed by perpendicular lines will always be the same. Take a look at this tutorial to learn about perpendicular lines and see a special trick involving them. [5:22]

Looks at parallel lines and intersecting lines (transversals), and the angles they form. [7:08]

Lines that are parallel have a very special quality. This tutorial takes a look at parallel lines and how they are different from other types of lines. [4:06]

Solving for measures of the angles in a triangle using algebra, the triangle sum theorem, and properties of angles created by a transversal that cuts parallel lines. [6:05]

This lesson defines perpendicular lines and gives an assessment to check understanding.

Assess your understanding of vertical angles and whether they are congruent after viewing this video lesson [3:54]

Demonstrates solutions to problems #1-3 of California Geometry released state test questions. Problems address understanding of deductive reasoning and congruent angles created by parallel lines cut by a transversal. [10:17]

Demonstrates solutions to problems #7-10 of California Geometry released state test questions. Problems address understanding of congruent angle pairs when parallel lines are cut by a transversal, counterexamples, and properties of the...

Demonstrates how to use the triangle sum theorem, properties of isosceles triangles, and special angle pairs formed when parallel lines are cut by a transversal to set up an equation using given algebraic expressions for angle measures...

Take a look at this tutorial to learn about how an angle is formed, how to name an angle, and how an angle is measured. [4:45]