Download - Geometry Perimeter And Area 1
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Geometry: Perimeter and Area
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Can You Name the Shape?
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Geometry: Perimeter and Area
New Vocabulary:Perimeter: The distance around a
geometric figure.Formula : An equation that shows a
relationship among certain quantities.Area: The measure of the surface enclosed
by a figure.
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WidthDefinition:
How wide a figure is from side to side.
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LengthDefinition:The measure of the distance across an figure.
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PerimeterTo calculate the
perimeter of any shape, just add up “each” line segment of the “fence”.
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Perimeter 3 in
2 in 2 in
3 in
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Perimeter 3 in
2 in 2 in
3 in
P= 2 + 3 + 2 + 3 = 10 in
You can find the perimeter of a rectangle by adding all of the sides together.
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Find the Perimeter Using a Formula
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PERIMETER OF ARECTANGLE
P=2l+2w
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2 in.
3 in.Perimeter of a RectangleP=2l+2wP=2(3 in.) + 2 (2in.)P=6 in. + 4 in.P=10 in.
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PERIMETER OF ATRIANGLE
P=s +s +s1 2 3
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Perimeter of a TriangleP=s + s + s
1 2 3
P=8cm+10cm+6cm
P= 24 cm
8cm
6cm
10cm
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RememberSquares ALL sides are equal…so if
they give you one side, you know ALL the sides
Length=the Largest sideIf they “leave” numbers out, they
are equal to their opposite side. If they give you the bottom of a square/rectangle type shape then the top is the same
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Finding area of an irregular figureBox the object
in then count the length and the width of the “box”.
Example:Length = 4Width = 5
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Find The Perimeter
What is the perimeter of this figure?
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Area is the amount of surface space that a flat object has.
Area is reported in the amount of square units.
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AREASquare units means that “that” many squares fit inside that
shape (if measured in feet…it’s feet…if meters…it’s meters. In this example the area is 4 square units…note 4 squares fit)
1
2 units (ft, in, m)
2
3 4
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Count the number of blue
squares to determine the area of that
surface.
The area is equal to 9 squares.
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Area = 15 square feet
What is the area of this surface if each square is equal to one foot?
Count the number of squares.
1 2
3
4 5 6 7 8
9 10 11 12 13 14
15
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Two neighbors build swimming pools. This is what the pools look like. Which family has the pool with the
bigger swimming area?
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The area of Family A’s pool is 8 square units.
The area of Family B’s pool is 7 square units.
Therefore, Family A has the pool with the bigger swimming area.
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Area of Squares/RectanglesLength x Width=Area
2
Length(2) x Width(2) = 4 square units
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Parallelogram AreaArea=Base x Height(Area=length x width)
BASE (length)
Height (width)
8
5
Base 8 x Height 5 = Area 40
The diagonal line is NOTthe height!!!