## All Activities

### Personal Number

3-5, 6-8
Find your personal number using your birthday! It is the month + date + year & month × date × year.

### IGD: Simson Line - Orthocenter

9-12
Use this tool to explore how the Simson line of a triangle is related to the orthocenter.

### IGD: Perpendicular Bisector

9-12
Use this tool to demonstrate how to draw a perpendicular bisector.

### Angle Bisector

9-12

This interactive demonstrates how to bisect an angle.

### A Geometric Investigation of (a + b)2

9-12
This interactive demonstrates why (a + b)2 = a2 +2ab + b2.

### Algebra Tiles

6-8, 9-12
Use tiles to represent variables and constants, learn how to represent and solve algebra problem. Solve equations, substitute in variable expressions, and expand and factor.

### IGD: Dropping a Perpendicular Line

9-12
Use this applet to show how to drop a perpendicular from a point onto a line.

### Patch Tool

Pre-K-2, 3-5
Use this tool to design a pattern using geometric shapes.

### Area of Trapezoids

6-8
Investigate how changes in the base and height of a trapezoid affect its area.

### Area of Parallelograms

6-8
This applet shows the relationship between the area of a parallelogram and the lengths of its sides.

### Product Game

3-5, 6-8
This applet is the Product Game: a fun, interactive game that exercises your skill with factors and multiples.

### IGD: Area of a Rectangle

3-5, 6-8
Use this tool to show how the side lengths of a rectangle affect the rectangle's area.

### Triangle Classification

9-12
Use this applet to show how the placement of the third vertex of a triangle affects the classification of that triangle.

### Investigating Functions with a Ferris Wheel: Distance vs. Width

Investigating Functions with a Ferris Wheel: Distance vs. Width A Web Sketchpad activity helps students make sense of relationships between quantities, in this case the way that the distance a car travels around a Ferris wheel covaries with its "width" or horizontal distance from the center of the Ferris wheel

### Investigating Functions with a Ferris Wheel: Distance vs. Height

Investigating Functions with a Ferris Wheel: Distance vs. Height A Web Sketchpad activity helps students make sense of relationships between quantities, in this case the way that the distance a car travels around a Ferris wheel covaries with its height. &lt;iframe src="/tools/ferriswheel/FerrisWheel_

### Name Letters

3-5, 6-8, 9-12
Use this activity to practice solving systems of equations. Use this tool to check students' answers.

### 5.1 Playing Fraction Track

3-5
Take timed turns racing to the end of each fraction line by moving one or more of your markers to sum to a given fraction value.

### Simson Line

9-12
This applet allows for the construction and exploration of the Simson Line.