Lesson 1-6Polygons

Ohio Content Standards:

Ohio Content Standards:Formally define geometric figures.

Ohio Content Standards:Use coordinate geometry to represent and examine the properties of geometric figures.

Ohio Content Standards:Make and test conjectures about characteristics and properties (e.g., sides, angles, symmetry) of two-dimensional figures and three-dimensional objects.

Vocabulary

VocabularyPolygon:

VocabularyPolygon:A closed figure formed by a finite number of segments

VocabularyPolygon:A closed figure formed by a finite number of segments

VocabularyConcave:

VocabularyConcave:A polygon that caves in on itself.

VocabularyConcave:A polygon that caves in on itself.

VocabularyConvex:

VocabularyConvex:A polygon that does not cave in.

VocabularyConvex:A polygon that does not cave in.

VocabularyConvex:A polygon that does not cave in.

Vocabularyn-gon:

Vocabularyn-gon:A polygon with n sides.

VocabularyRegular Polygon:

VocabularyRegular Polygon:A convex polygon which all sides and angles are congruent.

Polygons:Number of sides:

Polygons:Number of sides:3triangle

Polygons:Number of sides:4quadrilateral

Polygons:Number of sides:5pentagon

Polygons:Number of sides:6hexagon

Polygons:Number of sides:7heptagon

Polygons:Number of sides:8octagon

Polygons:Number of sides:9nonagon

Polygons:Number of sides:10decagon

Polygons:Number of sides:12dodecagon

Name each polygon by the number of sides. Then classify it as convex or concave, regular or irregular.

Name each polygon by the number of sides. Then classify it as convex or concave, regular or irregular.

Name each polygon by the number of sides. Then classify it as convex or concave, regular or irregular.

Vocabulary

VocabularyPerimeter:

VocabularyPerimeter:The sum of the lengths of the polygons sides.

A masonry company is contracted to lay three layers of decorative brick along the foundation for a new house given the dimensions below.

A masonry company is contracted to lay three layers of decorative brick along the foundation for a new house given the dimensions below.40 ft36 ft12 ft24 ft36 ft30 ft8 ft30 ft

A masonry company is contracted to lay three layers of decorative brick along the foundation for a new house given the dimensions below.40 ft36 ft12 ft24 ft36 ft30 ft8 ft30 ftFind the perimeter of the foundation and determine how many bricks the company will need to complete the job. Assume one brick is 8 inches long.

A masonry company is contracted to lay three layers of decorative brick along the foundation for a new house given the dimensions below.40 ft36 ft12 ft24 ft36 ft30 ft8 ft30 ftThe builder realizes he accidentally halved the size of the foundation, so he reworks the drawing with the correct dimensions. How will this affect the perimeter of the house and the number of bricks needed?

Find the perimeter of pentagon ABCDE with A(0, 4), B(4, 0), C(3, -4), D(-3, -4), and E(-3, 1).

Find the perimeter of pentagon ABCDE with A(0, 4), B(4, 0), C(3, -4), D(-3, -4), and E(-3, 1).

The width of a rectangle is 5 less than twice the length. The perimeter is 80 centimeters. Find the length of each side.

Assignment:

Pgs. 49 - 50 12-34 evens, 40-44 evens