Perimeter of Polygons

Notes 1.2

Perimeter and Area in the Coordinate Plane

Geometry

​Learning Target:

Find perimeter and areas of polygons in the coordinate plane.

Polygons

​In geometry, a figure that lies in a plane is called a plane figure.

​

​Polygon - a CLOSED plane figure that is formed by three or more line segments (called sides).

​A polygon is named by listing the vertices in consecutive order.

​Convex & Concave

​Convex - a line drawn through 2 consecutive points does NOT go through the interior

​

​Concave - a line drawn through 2 consecutive points goes through interior

​Identifying Polygons

​Recall that polygons can be identified by the number of sides.

​

​While some polygons have special names, in general they are named by the number of sides followed by "-gon."

​

​Ex: 13 sides is called 13-gon

​Perimeter and Area Formulas

​or

​Complete #1-9

​Stop here and complete questions 1-9 in the packet.

​

​Then return to the lesson to see the guided examples.

​Ex) Find perimeter and area of polygon (Square)

​Ex) Find perimeter and area of Polygon (Triangle)

​First use distance formula to find the length of the horizontal segment.

Complete Wkst 1.4 Practice.

​Take a photo of your work for this problem (#21).

UPLOAD it on SCHOOLOGY and submit assignment.