TITLE: St. Patrick's Day Adventure

SUBJECT: Pre-Algebra and Geometry.

TOPIC: Circumference, measurement, advanced calculations

INTERACTIVITY: Participants will measure the radius of the circumference of the rainbow (semicircle). They will also have to move the leprechaun around the rainbow throughout the activity.

DIRECTIONS: (on board)

Lucky the Leprechaun is going on a St. Patrick's Day adventure! It is your job to find out how long it takes Lucky to get to the pot of gold on the other side of the rainbow!

- Measure the diameter of the rainbow. (Measure from the outer most band of the rainbow. Also, 1 inch is equivalent to 1 mile.)
- Move Lucky to the top of the rainbow.

- Using the information provided on the handout, find the distance from Lucky's starting point to the top of the rainbow.
- Calculate the amount of time it takes for Lucky to get from his starting point to the top of the rainbow.
- Again, using the information provided on the handout, find the distance from the top of the rainbow to the pot of gold.

- Calculate the amount of time it takes for Lucky to get from the top of the rainbow to the pot of gold.
- Add the two times together to get the total amount of time for Lucky to get to the pot of gold.

TIME: It will only take a few minutes for students to complete the bulletin board. It is just a visual for students, and provides a measurable object. They just have to measure the radius, and move the leprechaun around the rainbow. The rest of the activity can be completed at a seat or at home.

SPECIAL CONSTRUCTION: Construction of the rainbow was very time consuming because each band is a perfect semicircle, and each is a half inch distance from the next. I used a giant, homemade compass made from two steel bars, one with a point and the other with a duct taped pencil attached. For a 3-D effect the rainbow was constructed on a piecec of foam board which was also pre-measured as a perfect semicircle. The border is shiny gold ribbon.

CREDIT: Extra credit, St. Patrick's Day related prize