1. HW: 3 area & perimeter Materials
Tuesday, 2/21/17
Write the IC and HW in your planner.
IC: Ch. 8.4
HW: 3 area & perimeter
Show work on all !!!!
Materials
Pencil
Slate, marker, eraser 1 1 1 1 1 1

2. Bellwork Find the area of the rectangles below: A = bh 3cm 0.25m 8cm1. 2.
3cm
0.25m
8cm
A = bh
1.5m
A = 8(3)
A = bh
A = 24 cm²
A = 1.5(0.25) 3.
A = bh
A = m²
¾ mi
A = ¾(¾)
¾ mi
A = mi²

3. Bellwork Find the perimeter of the rectangles below:
P = the sum of the sides 1. 2.
3cm
0.25m
8cm
P = the sum of the sides
1.5m
P =
P = the sum of the sides
P = 22 cm
P = 2(0.25) + 2(1.5)
P = m
P = 3.5 m

4. Bellwork Find the area of the shaded regions below: A= bh 3cm 0.25m1. 2.
3cm
0.25m
8cm
A = ½ (24 cm²)
1.5m
A = 12 cm²
A = ½ (0.375 m²)
A = m² 3.
A = ½ (9/16 cm²)
¾ mi
¾ mi
A = 9/32 cm²

5. Area and Perimeter of Composite Figures
7.G.6 – Chapter 8.4
Objective: TSWBAT find the area of composite figures using the formulas for rectangles and triangles.
Date _____________________
Area and Perimeter
of Composite Figures
Formula for area of rectangles: A = bh
Formula for area of triangles: A = ½bh
A = ½ bh
12 in
5 in
A = ½(16)(3)
3 in
A = (8)(3)
16 in
A = 24 in²
P = the sum of the sides
P =
P = 33 in

6. ? ? ? ? 12 2 5 5 Ex. 1 1) Find the value of each question mark.
2) What shapes do you have? 12 2 12 ? ?
Rectangle 5 5 5
A = bh
Triangle
A = ½ bh
3) Find the total area.
Triangle
Rectangle
Total
A = ½ bh
A = bh
10 units²
A = 2(5)
A = ½ (12)(5)
+ 30 units²
A = 10 units²
A = 40 units²
A = (6)(5)
A = 30 units²

7. Ex. 2 10.5 ft 10.5 ft 5 ft 18 ft 10 ft 10 ft 18 ft Triangle Rectangle
Total
A = ½ bh
A = bh
180 ft²
A = 18(10)
A = ½ (18)(5)
+ 45 ft²
A = 180 ft²
A = 225 ft²
A = (9)(5)
A = 45 ft²

8. Ex. 3 8 ft 8 ft 8 ft 6 ft 6 ft 6 ft 8 ft times 2 20 – 8 = 12 Triangle
12 ÷2 = 6
A = ½ bh
Square
Total
A = ½ (6)(8)
A = bh
64 ft²
A = 8(8)
A = (3)(8)
+ 24 ft²
+ 24 ft²
A = 64 ft²
A = 24 ft²
A = 112 ft²

9. Ex. 3 What is the perimeter of the trapezoid measured in feet?
P = sum of sides
P =
P = 48 ft

10. Ex. 4 3 ft 4 ft 10 ft 4 ft 4 ft 8 ft 8 ft 8 ft 4 ft 19 – 4 = 15ft

11. Find the area. Ex. 5 Parallelogram A = bh A = 9(5) A = 45 in² Triangle
Total
A = ½ (4)(3.5)
45 in²
A = (2)(3.5)
+ 7 in²
A = 7 in²
A = 52 in²