Area & Perimeter Area & Perimeter
Area & Perimeter Perimeter The distance around a shape – The sum of the lengths of all the sides in a shape – Measured in units of length i.e. Feet,
Dec 27, 2015
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Area & PerimeterArea & Perimeter
Perimeter
• The distance around a shape– The sum of the lengths of all the sides in a shape– Measured in units of length • i.e. Feet, miles, meters, etc
Area
• The space within a shape– Measured in units of length squared • i.e. ft2, mi2, m2, etc
Why feet squared?• Units for area are always squared because
they are describing how many little squares it would take to fill in the shape.– For example: 75 ft2 means that there are 75
squares that are 1 foot on each side needed to cover the space.
1 foot
1 fo
ot
Area of a square, rectangle & parallelogram
A = bh– Base and Height ALWAYS must form a 90 degree
angle!
6 meters
15 m
eter
s12 meters
Area = bh = 6 x 12 = 72 m2
AREA OF A PARALLELOGRAM
Welcome. Today you’re going to discover the formula for area of a parallelogram.
h
b
Click to Continue
AREA OF A PARALLELOGRAM
To do this let’s cut the left triangle and…
h
b
Click to Continue
slide it…
AREA OF A PARALLELOGRAM
h
h b
Click to Continue
slide it…
AREA OF A PARALLELOGRAM
h
h
b
slide it…
AREA OF A PARALLELOGRAM
h
h
b
slide it…
AREA OF A PARALLELOGRAM
h
hb
…thus, changing it to a rectangle.
What is the area of the rectangle?
AREA OF PARALLELOGRAM
h
b
bhA hbA bhA 2
Area of a triangle
– Base and Height ALWAYS must form a 90 degree angle! (be perpendicular)
8 feet
Area = bh ÷ 2 = 8 x 9 ÷2 = 36 ft2
Abh
2
9 fe
et
12 fe
et
What is the area of the square?
A = bh = 2 x 2 = 4 in2
What is the perimeter of the square?
P = s + s + s + s = 2 + 2 + 2 + 2 = 8 inches
What is the area of the rectangle?
A = bh = 8 x 3 = 24 cm2
What is the perimeter of the rectangle?
P = b + b + h + h = 8 + 8 + 3 + 3 = 22 centimeters
What is the area of the shape?
A = bh = 12 x 5 = 60 cm2
What is the area of the shape?
A = bh = 7 x 10 = 70 in2
What is the area of the shape?
Area = bh ÷ 2 = 4 x 15 ÷ 2 = 30 in2
What is the area of the shape?
Area = bh ÷ 2 = 6 x 9 ÷2 = 27 cm2
What is the area of the shape?
Area = bh ÷ 2 = 8 x 5 ÷2 = 20 in2
http://www.mathgoodies.com/worksheets/perimeter-area-wks.html
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