March 14, 2017
(11.1) Areas of Parallelograms and Triangles
Objective:
To find the areas and perimeters of parallelograms and
triangles.
Why: It will help allow us to find the areas of other figures.
March 14, 2017
Obj: To find the areas and perimeters of triangles.
Parallelogram:
height
base
A = bh
March 14, 2017
Obj: To find the areas and perimeters of triangles.
Find the perimeter and area of the parallelogram.
32 in
20 in
12 in
March 14, 2017
Find the area of the parallelogram.
45
Obj: To find the areas and perimeters of triangles.
9
o
12
March 14, 2017
Obj: To find the areas and perimeters of triangles.
Area of a Triangle
height
base
A=
1
2
bh
March 14, 2017
Obj: To find the areas and perimeters of triangles.
You need to buy enough boards to make the frame of the triangular sandbox
shown and enough sand to fill it. If one board is 3 feet long and one bag of
sand fills 9 square feet of the sandbox, how many boards and bags do you need
to buy?
16
7.5
12
7.1
March 14, 2017
Obj: To find the areas and perimeters of triangles.
The height of a triangle is 7 inches more than its base. The area of the
triangle is 60 square inches. Find the base and the height.
March 14, 2017
Obj: To find the areas and perimeters of triangles.
Find the area of an equilateral triangle with base 10 cm.
March 14, 2017
Obj: To find the areas and perimeters of triangles.
HF:
(HR) (11.1) Pg. 783: 11, 13, 16, 17, 19, 24, 27, 30, 31, 37, 39