Math Open Reference
Math Open Reference: Circumference (Perimeter) of a Circle
Learn about the circumference of a circle with this helpful reference tool. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Texas Instruments
Texas Instruments: Perimeter and Area of a Square
Students study the perimeter and area of a square, and explore the relationship between them and the length of the side of the square.
Texas Instruments
Texas Instruments: Area and Perimeter of Regular Polygons
Students determine the area and perimeter of regular polygons and use that information to conduct a beginning investigation of limits.
Texas Instruments
Texas Instruments: Area of Triangle
This Cabri Geometry activity enables students to review the relationship between the height of a triangle and its perimeter and area.
Texas Instruments
Texas Instruments: Dimensions and Area
In this activity, students discover the relationship between a change in the dimensions of a rectangle and the change in the corresponding area.
National Council of Teachers of Mathematics
Nctm: Illuminations: Igd: Area of a Triangle
Use this interactive tool to learn how to find the area of a triangle. Click on "Instructions" for details on how to use this tool. Click on "Explore" for more ideas. [Requires Java.]
Texas Instruments
Texas Instruments: Circles: Circumference and Area
The idea of perimeter can be applied not only to polygons but to circles as well. The same idea can be said for the area of a circle. (Continued. See "before the activity.") [Requires Adobe Reader.]
Texas Instruments
Texas Instruments: Maximizing the Area of a Rectangle
This activity is adapted from one of the TI books. Students measure lengths and widths of rectangles and record for the class to see. Each group's rectangle has the same perimeter, but different areas. After a discussion, students make...
Shodor Education Foundation
Shodor Interactivate: Triangle Explorer
This applet allows users to study the nature of triangles and their area. It draws random triangles on a Cartesian coordinate system. The user can determine the area of the triangle using his or her preferred method. After the calculated...
Math Open Reference
Math Open Reference: Perimeter of a Rectangle
Learn about the perimeter of a rectangle with this handy reference guide. Provides a detailed definition, examples, and interactive activities that enhance further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Perimeter of a Parallelogram
Learn about the perimeter 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: Area of a Square
A complete reference guide to finding the area of a square. It provides definitions, examples, and interactive activities that enhance further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Area of a Parallelogram
Learn about the area 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: 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.
Shodor Education Foundation
Shodor Interactivate: Shape Explorer
Learners practice calculating the perimeter and area of a given figure. The interactive activity and teacher resources are included.
Texas Instruments
Texas Instruments: Easy Programming of Geometry Formualas
In this activity, students perform area, surface area, perimeter, and volume.
National Council of Teachers of Mathematics
Nctm: Illuminations: Scale Factor
The interactive applet allows learners to explore the relationships between side length, area, and perimeter. Students see how changes in the scale factor influence the ratio of areas and perimeters. [Requires Java.]
Texas Instruments
Texas Instruments: Math Today Wildfires Nearly Snuffed
Students can use the data to explore the relationship between area and perimeter for rectangles and circles and they will make generalizations about the shape of the rectangle that will produce the smallest perimeter.
Shodor Education Foundation
Shodor Interactivate: Shape Builder
This activity operates in one of two modes: auto draw and create shape mode, allowing you to explore relationships between area and perimeter.
Texas Instruments
Texas Instruments: Building a Garden Fence
In this activity, students can use basic concepts of perimeter and area to investigate a classic problem situation requiring maximization. They must decide how to build a garden fence to enclose the largest possible area.
Texas Instruments
Texas Instruments: How Totally Square Part Ii
Students understand the concept of perimeter of a square, and discover its formula.
Analyze Math
Analyze Math: Rectangle Problems
The geometry tutorial investigates rectangles. Topics included are diagonals, area, and perimeter. The activity has several examples with detailed solutions.
National Council of Teachers of Mathematics
Nctm: Illuminations: Igd: Area of a Parallelogram
Use this interactive tool to learn how to find the area of a parallelogram. Click on "Instructions" for details on how to use this tool. Click on "Explore" for more ideas.
Analyze Math
Analyze Math: Applications of Functions
Learners examine applications of functions. Topics explored are length of a chord, volume, area, and perimeter. The activity includes examples with detailed solutions.