1. Bellwork
Copy the graphic organizer and draw a diagram inside each box to represent the pair.

2. Rigor Relevance Apply formulas for perimeter, area, and circumference.
Formulas help determine the amount needed and cost of materials.

3. Example 1: Solving for a Specific Variable
Option A
Option B
Plug in all given numbers
Solve for the remaining variable
EX: Simple interest is calculated with I = Prt (P = principal, r = annual interest rate, t = time). How long would it take a deposit of $500 to earn $100 with an interest rate of 5%?

4. The perimeter (P) is the sum of the side lengths of the figure
The perimeter (P) is the sum of the side lengths of the figure. Units for length (ft, m, in)
The area (A) is the number of square units of a given size that exactly cover the figure. Square units (ft2, m2, in2)

5. Triangles Circles Rectangle h b A = ½ bh A = r2 A = bh
Circumference (C)
C = 2r C = d
r = radius
d = diameter
Rectangle
A = bh
b=base, h=height h b

6. The base b can be any side of a triangle.
The height h is a segment from a vertex that forms a right angle with a line containing the base.

7. Example 2: Finding Perimeter and Area
Find the perimeter and area of the figure.

8. Example 3: Crafts Application
The Texas Treasures quilt block includes 24 purple triangles. The base and height of each triangle are about 3in. Find the approximate amount of fabric used to make the 24 triangles.
If the fabric costs $8 per square
foot, how much will the fabric
cost?

9. Example 4: Calculate the Circumference and
Area of a Circle
Calculate C and A of the 12in pizza in terms of p and to the nearest tenth.

10. Composite Figures
Composite figure– a region made of common, non-overlapping shapes
Area Addition Postulate – the area of a region is the sum of the areas of its non-overlapping parts

11. Example 5: Calculate the area of the shaded regions below.

12. Example 6: Real Life Application
A) If a runner were to run 4 laps on the outer track, about how far would he run? Use 3.14 for p.
B) The school re-sods the grass inside the track. About how many square yards should the school buy? Use 3.14 for p.

13. 1-5 Practice (not graded)
Put this in the non-graded section of your binder (with Bellwork)
Textbook pg 38 #6, 7, 9, 20 – 23, 26
Honors only: also do # 30

14. 1-5 Assignment (graded)
Workbook pg 30 #1 – 6
No work = no credit
Write area or circumference formulas down BEFORE plugging in numbers. This will help with memorization!
Due Monday for periods 1 & 5
Due Tuesday for periods 2, 4, 6, & 7