Lessons 12 1 and 12 3 Describe Plane

Lessons 12. 1 and 12. 3 Describe Plane Shapes and Identify Polygons

Lesson Opening In your math notebook describe (using words) the two shapes below.

Plane Shapes Both of these shapes are PLANE SHAPES or shapes on a flat surface.

Closed Shapes This is a closed shape, or a shape that starts and ends at the same point.

Closed Shapes These are all closed shapes.

Open Shapes This is an open shape, or a shape that does NOT start and end at the same point.

Open Shapes These are all open shapes.

Polygons Some closed shapes are made up of only line segments. These shapes are called polygons.

Polygons Some closed shapes are made up of only line segments. These shapes are called polygons. 1 2 5 3 4 This polygon has 5 line segments.

Polygons Some closed shapes are made up of only line segments. All of these shapes are polygons.

Describe this shape

Describe this shape • • Plane Shape Closed Shape Polygon Made up of 5 line segments

Describe this shape

Describe this shape • Plane Shape • Closed Shape

Polygons A closed shape that is made up only of line segments. – A triangle is a polygon with 3 sides (or 3 line segments). – A quadrilateral is a polygon with 4 sides (or 4 line segments). – A pentagon is a polygon with 5 sides (or 5 line segments).

Describe this shape

Describe this shape • • Plane Shape Closed Shape Polygon Quadrilateral (4 sides)

Describe this shape

Describe this shape • Plane Shape • Closed Shape • Circle

Describe this shape

Describe this shape • • Plane Shape Closed Shape Polygon Hexagon (6 sides)

Describe this shape

Describe this shape • • Plane Shape Closed Shape Polygon Pentagon (5 sides)

Review of what we have learned Plane Shapes (2 -dimensional shapes) Closed Shapes Not Polygons (circles, shapes with curved lines) Triangles (3 sides) Quadrilaterals (4 sides) Open Shapes Polygons Pentago ns (5 sides) Hexagon s (6 sides) Octagon s (8 sides) Other Polygons

Exit Ticket 1. Which terms describe the 2. Select all the terms that describe BOTH figures below. shape below? a. b. c. d. e. f. g. Plane shape Closed shape Open shape Polygon Triangle Quadrilateral hexagon a. b. c. d. e. f. g. Closed shapes Open shapes Plane shapes Polygons Triangles quadrilaterals pentagons