This unit designed for sixth grade geometry studies helps students to develop spatial sense and an understanding of geometric concepts by exploring models, properties and relationships and analyzing formulas. The students will be helped to demonstrate geometric relationships through the use of manipulatives. They will also be able to represent and solve problems using models. This unit will be helpful in improving math test scores as designated in school improvement plans. Terra Nova test scores show an inadequate mastery of geometry concepts at the sixth grade level. The students will be able to learn the meaning and use of geometric formulas, particularly Pi, and combine them with other lessons on geometry. By trying a concept that seems particularly difficult at first glance with fun activities, the students will be more willing to try new tasks that may at first be hard. The students will be able to apply the learned formula for Pi with the processes of area, circumference and volume of circles and spheres. The students will be able to connect the use of Pi to real life activities that relate to home, business and hobbies. The activities in this unit begin with a lesson called Discovering Pi, a lesson in discovering why Pi works and using it to find circumference. Activities for Pi Mathematics includes a history section, an information and video section, a project section, and a lesson application section to apply the formula and do practical problem solving. Circles in Geometry uses group and whole class activities to measure both diameter and circumference of familiar objects. Area of a Sphere demonstrates in a concrete fashion why the formula for surface area of a sphere works by incorporating a simple activity with a ball and wrapping paper.