Area and Perimeter

Unit Review Sheet

These facts and definitions should be mastered throughout this unit. This page can be used for periodic review and study as you are finishing the unit and in the future.

Facts and Definitions

Lesson 1: Review of Plane Shapes

Plane shape: 2 dimensional (2D), flat, with only length and width
Solid shape: 3 dimensional (3D), not flat, has 3 dimensions (height, width, depth)
Polygon: a closed, plane (2D) shape that is made up of three or more straight sides
Triangle: a polygon that has three sides
Quadrilateral: a polygon that has four sides
Square: a special kind of quadrilateral that has four sides that are the same length
Rectangle: a quadrilateral whose opposite sides are the same length
Pentagon: a polygon that has five sides
Hexagon: a polygon that has six sides
Octagon: a polygon that has eight sides
Circle: a closed, plane shape that has only one curved side
Side: a line that makes part of a shape or polygon
Vertex: the point where two sides of a shape or polygon meet
Angle: the space created inside a shape where the sides meet
A polygon is regular when all of its sides are the same length.
A polygon is irregular when it has sides that are of different lengths.

Lesson 2: What Is Perimeter?

Perimeter: refers to the outer edge or boundary of a space or object; it is also the distance around a plane or two-dimensional shape
To find the perimeter of a polygon, add together the length of each of its sides.
To find the perimeter of a regular polygon, multiply the number of sides of the polygon by the length of one of its sides.

Lesson 3: Calculating Perimeter

[none]

Lesson 4: More Work With Perimeter

[none]

Lesson 5: Problem Solving With Perimeter

[none]

Lesson 6: What Is Area?

Area: the measure of space within a plane or two-dimensional shape; the number of square units within a plane or two-dimensional shape
Square unit: a square whose sides each have a length of 1 unit, used to measure area
To find the area of a two-dimensional shape, count the total number of square units (square feet, square centimeters, square inches, etc.) contained within the shape.
sq.: the abbreviation of "square" (e.g., 12 sq. ft or 3 sq. cm).

Lesson 7: Calculating Area

To find the area of a rectangle, multiply the lengths of one of its long sides and one of its short sides (or its length times its width).

Lesson 8: More Work With Area

Composite shape: a shape that is made up of two or more basic shapes
To find the area of a composite shape, add together the areas of each separate shape that make up the composite shape.

Lesson 9: Creating With Perimeter and Area

[none]

Lesson 10: Problem Solving With Perimeter and Area

[none]

Lesson 11: Unit Test

[none]

Final Project: Shapesville

[none]