SB En Geom 10­1 Completed.notebook
November 15, 2012
Chapter 10
AREA
Nov 13­7:19 AM
Lesson 10­1 Areas of Parallelograms and Triangles
Thm 10­1
Area of a Rectangle
A = bh
Thm 10­2
h
b
Area of a Parallelogram
h
A = bh
base of a parallelogram ­ any of its sides
altitude
b
altitude ­ segment perpendicular to the line containing the base drawn from the opposite side of the base
height ­ the length of an altitude Nov 13­7:23 AM
1
SB En Geom 10­1 Completed.notebook
November 15, 2012
Expl 1. Find the area of each parallelogram. a.
4.5 in
b.
4.6 cm
4 in
5 in
3.5 cm
2cm
Ckpt 1. Find the area of a parallelogram with base 12 m and height 9 m.
Nov 13­7:28 AM
B
E
10in
A
. 2in
13in 1
D
F
C
Expl 2. Find CF to the nearest tenth.
Ckpt 2. A parallelogram has sides 15 cm and 18 cm. The height corresponding to a 15­cm base is 9 cm. Find the height corresponding to an 18­cm base.
Nov 13­7:36 AM
2
SB En Geom 10­1 Completed.notebook
Thm 10­3
November 15, 2012
Area of a Triangle
A = ½bh
base of a triangle ­ any of its sides
height ­ the length the altitude to the line containing the base
Expl 3. Find the area of the triangle.
6.4 ft
4ft
10 ft
Nov 13­7:41 AM
Ckpt 3. Find the area of the triangle.
13cm
5cm
12cm
Expl 4. in your book, page 536
F = 0.004Av 2
6ft
20ft
12ft
Ckpt 5. Double the base in the above figure, but keep the height the same. How if the force affected?
Nov 13­7:46 AM
3
SB En Geom 10­1 Completed.notebook
November 15, 2012
Homework
Lesson 10­1
1­14, 18­38E,
40­43
Nov 13­7:50 AM
4