Estimating Area

with Online Virtual Manipulatives



Created by,
Neal Schlegel

Curriculum Info  Meet the Author




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Introduction

Use online virtual manipulatives to develop a better understanding of area, perimeter, and circumference of various geometric shapes. Learn how to estimate those measurements, too!

Part 1:
    •1) Estimator Virtual Manipulative
This activity features an applet that presents three estimating situations. Problems challenge students to estimate the number of objects on the screen or estimate the length of a curve or area of a shape.
    •2) Parallelogram Virtual Manipulative
Investigate how changes in the base and height of a parallelogram affect its area.
    •3) Triangle Virtual Manipulative
Investigate how changes in the base and height of a triangle affect its area.
    •4) Circle Circumference Virtual Manipulative
Use pieces of string to estimate the circumference of a circle.
    •5) Circle Area Virtual Manipulative
Compare the area of a circle to its radius.
Part 2:
    •6) Triangle Explorer Virtual Manipulative
Students learn about areas of triangles and about the Cartesian coordinate system through experimenting with triangles drawn on a grid.
    •7) Area Explorer Virtual Manipulative
Students are shown shapes on a grid after setting the perimeter and asked to calculate areas of the shapes.
    •8) Perimeter Explorer Virtual Manipulative
Students are shown shapes on a grid after setting the area and asked to calculate perimeters of the shapes.
    •9) Area and Perimeter Explorer Virtual Manipulative
Students give the perimeter and area of random shapes on a grid.
    •10) Trapezoid Virtual Manipulative
Investigate how changes in the base and height of a trapezoid affect its area.
    •11) Circumference and Diameter of Circles Virtual Manipulative
This tool allows you to investigate the relationship between the circumference and diameter of a circle.
    •12) Area and Perimeter of Rectangles Virtual Manipulative
Click Skip Intro, then select Lessons, and then click on Lesson 12 for an interactive lesson on area and perimeter of rectangles. Help the contractors determine the proper amount of baseboards and carpet to buy.
    •13) Relating Area and Perimeter Virtual Manipulative
Click Skip Intro, then select Lessons, and then click on Lesson 13 for a lesson on the relationship between area and perimeter of rectangles. Learn how to maximize the area and minimize the perimeter. You can also minimize area and maximize perimeter.
    •14) Exploring Composite Figures Virtual Manipulative
Click on Grade 7, then click on Area and Perimeter and go to… Exploring Composite Figures Create composite figures made of several geometric shapes and determine their areas. You can also view an interactive video: “Exploring Area and Perimeter” at this web site.
    •15) Shape Surveyor (Area and Perimeter of Rectangles) Virtual Manipulative
Calculate area and perimeter of rectangles. Correct answers uncover pieces of a puzzle to reveal the mystery place.
    •16) Exploring Rectangles Virtual Manipulative
Study the relationships between length, width, area, and perimeter of a rectangle.
    •17) Exploring Perimeter and Area Virtual Manipulative
Students learn how to calculate area and perimeter and practice at different levels of difficulty.
    •18) Finding Area of Geometric Shapes Virtual Manipulatives
Scroll down to “Area” for seventh grade level instruction and practice for finding areas of squares, rectangles, parallelograms, trapezoids, triangles, and circles.
    •19) Area of Rectangle Model Virtual Manipulative
Learning about Multiplication Using Dynamic Sketches of an Area Model.
    •20) Perimeter and Area of Similar Rectangles Virtual Manipulative
Learning about Length, Perimeter, Area, and Volume of Similar Objects Using Interactive Figures: Side Length and Area of Similar Figures. How does changing the size of an object (but keeping its proportions the same) affect its area?
    •21) Powers of Ten
Before your very eyes see the perspective expand from a 1-meter view of a rose bush to an expanded vision of 10 to the 26 power and then decrease to 10 to the negative 15.
Part 3:
    •22) Google Search
Google results for “online virtual manipulatives estimating area.” This search returns links to over 100,000 web sites.

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Last updated: November 29 2006, 7:10 am
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