FABULOUS Perimeter-Formulas for practicing and figuring Perimeter-of Squares, Rectangles, Triangles, Compound-Shapes, Finding missing-measures of sides, etc. SMARTBOAR-Slides-LESSON. WONDERFUL VALUE = 34 slides total, complete lesson on Perimeter. Interactive practice for your students. Everything you need to teach Perimeter! You'll enjoy using this year after year!WARNING: You MUST have SMART Technologies SMART software, and a SMARTBOARD to teach from, to effectively download, open and use this