Activity Detail

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	Cross-Fencing Pastures

Activity Overview

In this activity, students use the Geoboard to determine the areas of polygons by dissecting them into parts that are squares, rectangles, and triangles.

Before the Activity

Start the Geoboard App and format it

See the attached PDF file for detailed instructions for this activity

Print pages 51 - 60 from the attached PDF file for your class

Activity Downloads:

(file types)

Shaping_MG_Geoboard_Act05.pdf
Shaping_MG_Geoboard_Appendix.pdf

During the Activity

Distribute the page to the class.

Follow the Activity procedures:

Construct a hexagon and find its area by counting squares and half squares

Find the area of a trapezoid by using a surrounding rectangle and check the answer using the calculator

Find the area of the trapezoid by dividing it into rectangles and triangles

Dissect triangles and ensure that every smaller triangle has at least one vertical or horizontal line segment as one of its sides, so that both the base and height of each triangle are whole numbers

Draw given shapes on the geoboard and find their area by using the dissection method

After the Activity

Student complete the Activity sheet and answer questions.

Review student results:

As a class, discuss questions that appeared to be more challenging

Re-teach concepts as necessary

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