Journal Prompt
• On a separate piece of paper:– With only two units left of the semester, how do
you feel about Geometry?• What was your favorite topic?• What was your least favorite?
– How do you feel about your current grade?• What are you going to do to keep it up?• What are you going to do to bring your grade up?
• Turn in to Mr. K
Unit 9 Essential Questions
• How do areas of similar polygons compare?
• How are the areas of polygons and circles related and applied?
Unit 9 Bonus Question• A farmer has a goat and he is trying to decide where to allow him to
graze.
• Option 1: He can be tethered to the side of a square 10ft by 10ft shed. The tethering rope is 18 feet long and tied to a post in the middle of one of the sides.
• Option 2: A 14 feet by 17 feet rectangular fenced in area. He has a rhombus shaped shed in the middle of the fence that has a diagonal length of 4 feet and 3 feet that the goat will not be allowed to enter.
• Which option should the farmer choose so the goat will have more area to graze? Provide mathematical reasoning behind your answer.
Today’s Objective
• Students will be able to find the perimeter, area, and circumference of polygons
Definitions
Perimeter: The distance around a figure (sum of all sides)
Area: The amount of square units inside a figure
Circumference: The distance around a circle
Area of a Rectangle
h
b
Area of a Square
s
s
Area of a Triangle
b
Area of a Circle
r
Circumference of a Circle
r
Ex. 1 Find area and perimeter
7 cm
4 cm
Ex. 2 Find the area and Circumference
14 cm
Ex 4 Find the area of the shaded region
Ex. 5 Find the area
Ex 6 Find the area
Ex 7 Find the area
Ex 8 Find the Area
Classwork
• Complete Evens from page 2 of packet
• Get checked off by Mr. K when finished
Homework
• Do Odds from Page 2 of packet