Mathigon
Mathigon: Euclidean Geometry: Introduction
Mathematicians in ancient Greece were amazed by mathematical patterns, and wanted to explore and explain them. They began to study mathematics just "for fun" without a specific application in mind. One of these mathematicians, Thales of...
Mathigon
Mathigon: Geometry: Triangles and Trigonometry: Properties of Triangles
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...
Mathigon
Mathigon: Geometry: Polygons and Polyhedra: Polygons
This lesson focuses on polygons; a polygon is a closed, flat shape that has only straight sides. Polygons can have any number of sides and angles, but the sides cannot be curved.
CK-12 Foundation
Ck 12: Interactive Geometry: 5.5 Geometry Software for Constructions
Use interactive geometry software to construct an equilateral triangle that maintains its shape even if you move its vertices.
CK-12 Foundation
Ck 12: Interactive Geometry: 2.5 Geometry Software for Reflections
See how geometry software expresses geometric shape reflections.
CK-12 Foundation
Ck 12: Interactive Geometry: 1.9 Composite Shapes
Learn how to manipulate and measure composite shapes.
CK-12 Foundation
Ck 12: Interactive Geometry: 2.1 Transformations in the Plane
Explore the process that changes the shape, size or position of a figure to create a new image, transformations.
CK-12 Foundation
Ck 12: Interactive Geometry: 1.12 Cross Sections of Solids
See how the cross-sections of solids relate to their shapes.
CK-12 Foundation
Ck 12: Interactive Geometry: 1.11 Surface Area and Nets
Explore surface areas and nets with 2D and 3D shapes.
CK-12 Foundation
Ck 12: Interactive Geometry: 4.7 Theorems About Quadrilaterals
Use quadrilateral properties that are unique to parallelograms to prove that the given shape is a parallelogram.
CK-12 Foundation
Ck 12: Interactive Geometry: 2.6 Reflection Symmetry
Explore reflection symmetry in some different shapes.
CK-12 Foundation
Ck 12: Interactive Geometry: 2.4 Reflections
Explore the rigid transformations of shape reflections.
Math Planet
Math Planet: Geometry: Polygons
A definition, examples, and a video lesson all help to explain polygons. [0:43]
Mathigon
Mathigon: Geometry: Symmetry Groups
This lesson focuses on symmetry groups; some shapes have more than one symmetry. You can add two symmetries to form a new one. It provides examples and practice exercises including a "symmetry calculator."
CK-12 Foundation
Ck 12: Interactive Geometry: 9.5 Modeling in Three Dimensions
Explore connections between a 2-dimensional net and a 3-dimensional box. Later in this section, use equations with variables to solve real world problems that use 2 and 3-dimensional objects.
CK-12 Foundation
Ck 12: Interactive Geometry: 2.7 Rotations
Understand the rigid transformation of a rotation.
Mathigon
Mathigon: Geometry: Circle and Pi: Conic Sections
The circle is one of four different shapes which can be created using "slices" through a cone, a 3-dimensional solid that has a circular base joined to a single point (called the vertex) by a curved side. If you tilt a cone, you get an...
Mathigon
Mathigon: Geometry: Transformations and Symmetry: Dilations
This lesson focuses on dilations, a dilation is a transformation that resizes a geometric shape, by making it bigger or smaller.
CK-12 Foundation
Ck 12: Interactive Geometry: 9.4 Connections Between Two and Three Dimensions
Cross-sections are one way that two-dimensional objects are connected to three-dimensional objects.
CK-12 Foundation
Ck 12: Interactive Geometry: 1.10 Volume of Solids
Explore the volume of solid figures.
AAA Math
Aaa Math: Circumference of a Circle
Calculating the circumference or perimeter of a circle has gotten easier with this formula and practice for finding the circumference.
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