1. Warm Up
Find the length of each segment in the triangle using the graph. Use correct notation when writing your answers.

2. Basic Formulas Used in Geometry Part 2
Unit 9 Notes

3. Vocabulary Perimeter- the distance around a figure (units of length)
Circumference- the distance around a circle (units of length)
Area- the amount of surface covered by a figure (square units such as 𝑓𝑡 2 or 𝑚 2 .

4. Basic Formulas

5. Ex.1 Measurements of a Football Field
Immediate Questions: What are the dimensions of a football field not including the end zone? Length: Width: Find the Perimeter and the Area and write answer using correct units.

6. Doritos Crash the Super Bowl!

7. Ex.2 Doritos
Immediate Questions: What shape are Doritos chips? Let’s draw a diagram: Find the perimeter and area of a chip.

8. Ex.3 Find the Circumference and Area of a Circle.
I found this badge on amazon in honor of the Super bowl. What is the Area and Circumference of my new badge? Use 3.14 for to approximate the value of 𝜋. Write your answer using correct units.
9 cm

9. Practice!
Find the area and perimeter (or circumference) of each figure. If needed, round to the nearest tenth.

10. Ex. 4 Find the area and perimeter of the triangle
Ex.4 Find the area and perimeter of the triangle. Round to the nearest tenth if needed.

11. Ex.5 Find an unknown length.
The base of a triangle is 28 meters. Its area is 308 𝑚 2 . Find the height of the triangle.

12. Practice!
The area of a triangle is 64 𝒎 𝟐 and its height is 16 meters. Find the length of its base.
The perimeter of the rectangle is 25 in. Find the width, w.

13. Assignment
Blue Workbook p #1-13, 23-27, 29-30

14. HW Answers

15. HW Answers

16. HW Answers

17. HW Answers