Post on 19-Mar-2016
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Area of Rectangles
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Area - The number of square units (units2) it takes to cover the surface of a figure.
ALWAYS label units2!!!
How many 1 ft2 tiles does it take to cover the rectangle?
Use the squares to find out!
Look for a faster way than covering the whole figure.
12 ft
6 ft
A = length(width)A = lw
A = side(side)A = s2
The Area (A) of a rectangle is found by using the formula:
The Area (A) of a square is found by using the formula:
65 What is the Area (A) of the figure?
15 ft
6 ft
66 Find the area of the figure below.
7
67 Dr. Dan wants to keep his kitten from running through his flower bed by putting up some fencing. The flower bed is 10 ft. by 6ft. Will Dr. Dan need to know the area or the perimeter of his flower bed to keep his kitty from trampling the flowers?
A Area
B Perimeter
68 Now solve the problem....
Dr. Dan wants to keep his kitten from running through his flower bed by putting up some fencing. The flower bed is 10 ft. by 6ft. How much fencing will he need?
Area of Parallelograms
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Area of a ParallelogramLet's use the same process as we did for the rectangle. How many 1 ft2 tiles fit across the bottom of the parallelogram?
Area of a Parallelogram.Let's use the same process as we did for the rectangle. If we build the parallelogram with rows of 14 ft2, what happens?
How tall is the parallelogram?How can you tell?
14 ft
How does this help us find the area of the parallelogram?
14 ftHow do you find the area of a parallelogram?
4 ft
A = base(height)A = bh
The Area (A) of a parallelogram is found by using the formula:
Note: The base & height always form a right angle!
Example.
Find the area of the figure.4 cm
4 cm
2.2 cm 2.2 cm1.9 cm
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4
Try These.
Find the area of the figures.
8
75
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11 m
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14 m
11 m
20 m
69 Find the area.
11 ft 10 ft
12 ft
70 Find the area.
17 in
17 in
10 in 12 in12 in
71 Find the area.
7 m
13 m 13 m
7 m
11 m
72 Find the area.