CK-12 Foundation
Alternate Interior Angles: Lesson
Concepts of alternate interior angles parallel the concepts of corresponding angles. Using a diagram, the presentation defines and identifies alternate interior angles formed by a transversal and two parallel lines. The video in a...
CK-12 Foundation
Corresponding Angles: Lesson
Take a parallel view of correspondence. The resource, part of a playlist on basic geometry, introduces the corresponding angle postulate. By first identifying corresponding angles, the video highlights the relationship between the angle...
CK-12 Foundation
Perpendicular Lines: Lesson
Perpendicular lines are all right. Using the definition of perpendicular, the video lesson introduces perpendicular lines.The portion a basic geometry playlist makes connections between the rules of parallel lines and perpendicular lines.
CK-12 Foundation
Parallel and Skew Lines: Lesson
Is it possible for a pair to be parallel and skew? The resource provides the class opportunities to find out by examining the properties of parallel and skew lines. Part of a playlist on basic geometry, the video includes a brief...
CK-12 Foundation
Two-Column Proofs: Lesson
Why is it a two-column proof? A video introduces the class to the concept of a two-column proof and how to set one up. The segment of a playlist on basic geometry highlights the types of reasons that can be in a proof.
CK-12 Foundation
Properties of Equality and Congruence: Lesson
What properties of equality also work for congruence? Part of basic geometry playlist, the video relates algebraic properties to their counterparts of congruence. Learners see how the properties mean the same whether with equality or...
CK-12 Foundation
Conjectures and Counterexamples: Lesson
The first five are red, so they all must be red, right? As part of a larger playlist on basic geometry, the video walks through an example of a conjecture and counterexamples by using a scenario of pulling candy out of a bag.
CK-12 Foundation
Converse, Inverse, and Contrapositive: Lesson
Is it true? Use an inquisitive resource to find the truth of related statements. Using short-hand notation, the video shows how to write the converse, inverse, and contrapositive of a conditional statement. The segment a larger geometry...
CK-12 Foundation
If - Then Statements: Lesson
If the hypothesis is true, then the conclusion is true too. The presentation, part of a larger playlist on geometry, introduces conditional statements. The resource shows how to rewrite a statement into if-then format and how to identify...
CK-12 Foundation
Deductive Reasoning: Lesson
It is elementary, my dear Watson. A segment in a playlist on geometry introduces the idea of deductive reasoning. The video goes over three rules that apply to deductive reasoning and conditional statements.
CK-12 Foundation
Inductive Reasoning: Lesson
Let's get specific about the general conclusion. The video, a portion of an extensive geometry playlist, introduces inductive reasoning. Using patterns, the resource explains how inductive reasoning goes from the specific to general.
CK-12 Foundation
Classifying Polygons: Lesson
For your eyes only: classify the names of polygons. After providing the definition of a polygon, the video introduces the two major classifications of polygons, concave and convex. The segment of a larger playlist on geometry continues...
CK-12 Foundation
Classifying Triangles: Lesson
That's correct, it is right and scalene. The video introduces the two methods for classifying triangles, sides, and angles. A resource in the playlist for basic geometry provides the definitions for each of the classifications.
CK-12 Foundation
Vertical Angles: Lesson
Define angles across from each other. An informative segment from a larger playlist on geometry introduces vertical angles and shows they have equal measures. Using their properties, the presenter solves problems involving vertical angles.
CK-12 Foundation
Supplementary Angles: Lesson
Supplement your knowledge of angles. Part of a playlist exploring geometry concepts, an interesting video introduces the definition of supplementary angles. Using the definition, the presentation shows how to find the supplement to a...
CK-12 Foundation
Linear Pairs: Lesson
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...
CK-12 Foundation
Complementary Angles: Lesson
Complement the angle definition. The resource, a video within a basic geometry playlist, introduces the definition of complementary angles. Using the definition, the presentation finds complements of given angles.
CK-12 Foundation
Classifying Angles: Lesson
It's time to put the angles in place. Using diagrams, the video presents the basic definitions of the four classifications of angles. The segment in an informative playlist on basic geometry also provides informal descriptions of the...
CK-12 Foundation
Measuring Angles: Lesson
Develop a degree of measurement. With the aid of a protractor, the video shows how to measure angles. The segment of a larger playlist on geometry basics points out that it is possible to start at a value other than zero when measuring...
CK-12 Foundation
Measuring Distances: Lesson
Let's rule the coordinate plane. By reviewing the marking on rulers, the video discusses how to determine the measurement between two points. The resource, a portion of a basic geometry playlist, determines the length of a side of a...
CK-12 Foundation
Basic Geometric Definitions: Lesson
Build up the basics of geometry, one point at a time. The segment in an extensive playlist on basic geometry provides the definitions of the essential building blocks of geometry. Using drawings, the video shows examples and descriptions.
CK-12 Foundation
Midpoints and Segment Bisectors: Lesson
Let's meet in the middle. As part of a comprehensive playlist on basic geometry, the video introduces the definitions of a midpoint and segment bisector. The resource shows a graphical approach to finding the midpoint of a line segment...
CK-12 Foundation
Ck 12: Episd: How Earth Formed
[Free Registration/Login may be required to access all resource tools.] View a National Geographic video featuring the way the Earth was formed. [1 hr. 30 min.]
CK-12 Foundation
Ck 12: Characteristics of Life
[Free Registration/Login may be required to access all resource tools.] An instructional video discussing general characteristics of life with examples. [6:08]