1. Geometry Chapter 1 section 3 Using Formulas

2. Area Area is measured in square units An in 2 is a square 1 inch on a side

3. Area formulas Rectangle l w where l is the length of the rectangle and w is the width of the rectangle 12 5 Area = 5(12) 60

4. Perimeter Perimeter is the distance around a figure Distance is measured in length units

5. Perimeter formulas Rectangle 2 l + 2 w where l is the length of the rectangle and w is the width of the rectangle 12 5 Perimeter = 2(5) + 2(12) 10 + 24 34

6. U - Try lw AreaPerimeter 58 630 428 2422

7. Maximize the area given a perimeter Divide the perimeter by 2 Look at all the sets of 2 #’s that add up to this # Multiply those sets of #’s together till you find the biggest one

8. Given a perimeter of 20 ft. find the maximum area it can enclose 20 / 2 = 10 So l +w = 10 lw Area 1 2 3 4 5

9. Given a perimeter of 12 ft. find the maximum area it can enclose ___ / 2 = ___ So l +w = ___ lw Area 1 2 3 4 5 U - Try

10. Do Now Page 22 – 24 Problems 5-9 15 – 36, 43, 44 - 52