The document is a lesson plan on calculating the area of triangles and trapezoids. It provides the formulas for finding the area of triangles using 1/2 base times height, and the area of trapezoids using 1/2 times the height times the sum of the two bases. Examples are given of finding the area of various triangles and trapezoids. As homework, students are assigned problems 1-10 and 16 on page 560 to practice these area calculations.

1. 10.2 Area of Triangles & Trapezoids April 18, 2012
Find the area of the parallelograms.
2 ft 10 cm
12 in 6 cm
Bellwork
Objective: Find area of triangles & trapezoids
HW pg. 560 #1­10, 16 1

2. 10.2 Area of Triangles & Trapezoids April 18, 2012
HW pg. 560 #1­10, 16 2

3. 10.2 Area of Triangles & Trapezoids April 18, 2012
Area of Triangles: ½ bh
5 cm 5 cm
3 cm
8 cm
HW pg. 560 #1­10, 16 3

4. 10.2 Area of Triangles & Trapezoids April 18, 2012
Find the area of the triangles.
8.2 ft
1.8 ft 4 ft
5m 5.4 m
5 ft
2m
HW pg. 560 #1­10, 16 4

5. 10.2 Area of Triangles & Trapezoids April 18, 2012
Area of Trapezoids: ½h(b1 + b2)
b1
h
Find the area of the trapezoid. b2
40 ft
4 ft
28 ft
HW pg. 560 #1­10, 16 5

6. 10.2 Area of Triangles & Trapezoids April 18, 2012
Find the area of the trapezoids.
24 mm
4 ft 12 mm
2 ft
4.5 ft
33 mm
HW pg. 560 #1­10, 16 6

7. 10.2 Area of Triangles & Trapezoids April 18, 2012
10.2 HW
pg. 530
#1­10, 16
HW pg. 560 #1­10, 16 7