# Surf for More Math

## Lesson 4 **- Constructing Polygons**

To encourage your child to have fun on the Web
while learning about Constructing Polygons, here are some games and
interactive activities they can do on their own or in pairs.

**Goal**

Construct polygons based on angle measures and side lengths.

**Builds Upon**

Student Book pages 218-220

**Instructions for Use**

** **

Polygons**
**allows your child to measure the angles of polygons using an
interactive protractor.

To use Polygons, click in the protractor button to pop up the protractor
on the screen. To move the protractor or rotate it on the screen, grab
the small circle on the protractor and drag it. Set the number of sides
for the polygon using the up and down arrows on the number button. Click
the number button, to pop up a polygon. Click the up or down arrows
of the yellow-triangle button to increase or decrease the size of the
polygon.

To measure the polygon, grab the protractor and move it over the polygon.
Place the center base of the protractor on any point on the polygon.
Align the base of the protractor with the side length of the polygon.
Measure the angle of the polygon. Move the protractor to another length
of the polygon and measure another angle.

Click on any points of the polygon to change its shape. Click the 'Reset'
button to start again. Click the 'Quit' button to exit the program.

** **

Polygon
Angle Applet** **allows your child to identify and
classify regular polygons.

To use Polygon Angle Applet , scroll down to find the applet. Input
the number of sides of a regular polygon and click the 'Solve' button.
The name of the polygon, the sum of the measure of the interior angles,
the measure of each interior angle, and the measure of each exterior
angle will appear.