Math.com
Math.com: Quadrilaterals
The lesson investigates types of quadrilaterals. Definitions, examples, and a worksheet are available.
Texas Instruments
Texas Instruments: Angle Bisectors and Medians of Quadrilaterals
In this activity, students will construct angle bisectors and medians in quadrilaterals and explore the properties that appear to be true for four-sided figures. They may find it necessary to review the definitions and properties of...
Math Is Fun
Math Is Fun: Interactive Quadrilaterals
Resize and rotate different types of quadrilaterals--square, rectangle, rhombus, trapezoid, and kite--while learning the definitions of these different shapes and labeling the angles and diagonals. CCSS.Math.Content.3.G.A.1 Understand...
Texas Instruments
Texas Instruments: Constructing Quadrilaterals
In this activity, students will construct different types of quadrilaterals from the quadrilateral hierarchy. This activity asks for constructions based on a minimal definition of the quadrilateral. The activity will reinforce the...
Alabama Learning Exchange
Alex: What Do We Have in Common?
This inquiry lesson explores the definitions of quadrilaterals and the properties of the diagonals of quadrilaterals to classify quadrilaterals. Students will work cooperatively to justify conclusions. This lesson plan was created by...
Wolfram Research
Wolfram Math World: Rectangle
MathWorld provides the definition of a rectangle and the area formula of a rectangle.
Alabama Learning Exchange
Alex: Quadrilaterals
This is an inquiry lesson used to review Algebra 1 objectives by applying them to geometry concepts. Students explore the properties of quadrilaterals and classify them by definition. This lesson can be use in geometry classes. Students...
Math Open Reference
Math Open Reference: Area of a Kite
A complete reference guide to finding the area of a kite. It provides definitions, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Area of a Trapezoid
Learn about the area of a trapezoid with this helpful reference tool. Provides a detailed definition, examples, and interactive activities that enhance further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Interior Angles of a Parallelogram
Learn about the interior angles of a parallelogram with this helpful reference tool. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Perimeter of a Rhombus
Learn about the perimeter of a rhombus with this helpful reference tool. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Perimeter of a Kite
A complete reference guide to the perimeter of a kite. It provides definitions, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Diagonals of a Rhombus
Learn about the diagonals of a rhombus with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Area of a Rectangle
Learn about the area of a rectangle with this helpful reference tool. Provides a detailed definition and interactive activities that enhance further explanation. Includes links to related topics.
Wolfram Research
Wolfram Math World: Heron's Formula
This site provides a detailed overview of Heron's Formula. Content includes a definition, example, and formula.
The Math League
The Math League: Figures and Polygons
This site provides definitions of different types of polygons and figures.
National Council of Teachers of Mathematics
The Math Forum: Problems Library Geometry Triangles
This site contains a wealth of problems that deal with the basic definitions of medians, altitudes, angle bisectors, and perpendicular bisectors or the defining characteristics of the different types of triangles. There are also...
Math Is Fun
Math Is Fun: Quadrilaterals
Students learn about the terminology and properties associated with quadrilaterals. The learning resource consists of definitions, diagrams, an exploration activity, and examples.
Illustrative Mathematics
Illustrative Mathematics: 4.g What Shape Am I?
In this task, students ultimately use the definitions they are given for three types of quadrilaterals and what they know about parallel sides to identify that a square fits all the definitions and explain why. Aligns with 4.G.A.2.
Cuemath
Cuemath: Geometric Shapes
In this mini-lesson plan, you will learn about the definition of geometric shapes and view many examples. You can check out the interactive simulations to know more about the lesson plan and try your hand at solving a few interesting...
University of Georgia
University of Georgia: Inter Math: Kite
This site provides a brief definition and example of a geometric kite.
Wolfram Research
Wolfram Math World: Kite
MathWorld provides the definition and the area formula for a kite.
Math Open Reference
Math Open Reference: Rhombus
A complete reference guide to the rhombus. It provides definitions and an interactive activity that enhances further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Rectangle
Learn about rectangles with this helpful reference tool. Provides a detailed definition, examples, and interactive activities that enhance further explanation. Includes links to related topics.