This lesson focuses on the properties of triangles, a closed shape that has three sides, three vertices, and and three internal angles. There are different types of triangles such as a right triangle, obtuse, and acute based on the...

This lesson focuses on Euclid's Axioms, simple, intuitive statements, that everyone agrees are true. An axiom(or postulate) is a mathematical statement that is regarded as "self-evident" and accepted without proof. A key part of...

See how geometry software performs rotations.

Provides advanced information about circles through the use of examples and a brief video lesson. [1:00]

Rhombus, the mathematically correct term for "diamond" is the focus of this interactive lesson.

This lesson focuses on wallpaper groups. While there are infinitely many possible patterns, they all have one of just 17 different symmetry groups. These are called the Wallpaper Groups. Every wallpaper group is defined by a combination...

This lesson focuses on tessellations, a tessellation is a geometric pattern that covers a surface without gaps or overlaps. They can be seen everywhere in nature such as a honeycomb or a tortoise shell.

This lesson focuses on the real world applications using triangles and trigonometry.

This lesson focuses on polyhedra other than the platonic solids; these include an Archimedean solid, a polyhedron made up of different kinds of regular polygons, that looks the same from every direction. There are 13 different...

This lesson focuses on the characteristics of a circle including similarity, radius, circumference, and Pi. It provides formulas to determine the area of a circle, calculating Pi, and learning exercises throughout.

This lesson focuses on the Triangle Inequality, when the sum of the lengths of any two sides of a triangle is greater than the length of the third. When this happens, the three sides cannot form a triangle.

A geometry lesson that examines the history and structure of ancient pyramids and engages students in constructing pyramid models. A comprehensive lesson that considers students with diverse learning styles. Math concepts introduced...

A lesson, practice exercise, and resource for use when planning classroom instruction on linear quadratic systems. Find definitions, example equations and graphs, a four-question quiz with solutions, and an activity through which...

[Free Registration/Login may be required to access all resource tools.] This concept teaches students about tangent lines and how to apply theorems related to tangents of circles.

Learn about conditional probability in everyday situations, where additional information is known.

If two triangles are similar, it means that all corresponding angle pairs are congruent and all corresponding sides are proportional. However, in order to be sure that two triangles are similar, you do not necessarily need to have...

Explore and understand triangle similarity.

A deep dive into the area and circumference of circles.

Explore the process that changes the shape, size or position of a figure to create a new image, transformations.

Explore the rigid transformations of shape reflections.

Explore surface areas and nets with 2D and 3D shapes.

Explore and discover the Pythagorean theorem.

A basic review of circles and how to calculate the circumference, radius, diameter, and area. Includes practice questions.

Knowledge in Action! Today you will find out if the students are understanding the idea of decomposing and composing shapes with pattern blocks.