Areas: Parallelograms, Triangles, and Trapezoids

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Chapter 9.4

• Areas Parallelograms, Triangles, and Trapezoids
• Page 531

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page 531
A parallelogram is a four sided figure with two
pairs of parallel sides
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page 531
Parallelograms
4
page 531
The area of a parallelogram A b x h
height
base
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page 531
Find the area of a parallelogram A b x h
5 km
7 km
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page 531
Find the area of a parallelogram A b x h
6 m
1.2 m
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page 531
Find the area of a parallelogram A b x h
h
b
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page 531
Find the area of a triangle A b x h
h
b
9
page 531
Find the area of a triangle
h
b
10
page 531
Find the area of a triangle
6 m
9 m
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page 532
Find the area of a triangle
5.5 cm
6.25 cm
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page 533
Trapezoid is a polygon with four sides, two of
which the bases are parallel.
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page 533
Put these two trapezoids together.
a
b
a
b
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page 533
Put these two trapezoids together.
a
b
a
b
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This makes a parallelogram whose base is the sum
of a and b
a
b
a
b
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page 533
The area of this parallelogram is the base (a
b) times the height h
a
b
h
a
b
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This can be represented by
a
b
h
a
b
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page 533
The trapezoidal area is half of this
b
h
a
19
page 534
Find the area
12 cm
7 cm
18 cm
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page 534

• Find the area of this kite

13.5 in
4 in
4 in