Chapter 28: Perimeter of Plane Figures

Lesson 1: Hands On: Explore Perimeter. Objective: To measure the perimeter of polygons using nonstandard and standard units.

Lesson 2: Estimate and Find Perimeter. Objective: To use formulas to find the perimeter of polygons.

Lesson 3: Hands On: Circumference. Objective: To explore finding the circumference of a circle.

Lesson 4: Problem Solving Skill: Use a Formula. Objective: To use the problem solving skill *use a formula* to solve problems.

Vocabulary: polygon, variable, perimeter, formula, circumference

**polygon:** a closed place figure that has straight sides and that is named by the number of its sides and angles

**variable:** a letter that can stand for any number

**perimeter:** the distance around a closed figure

**formula: **a mathematical rule that is expressed with symbols

**circumference: **the distance around a circle

Our textbook website: www.harcourtschool.com

Some good practice websites:

http://www.gamequarium.com/placevalue.html

http://www.softschools.com/math/games/

www.multiplication.com

www.funbrain.com