Area of Triangles

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Area of Triangles
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Area of a Triangle Let's use the same process as
we did for the rectangle parallelogram. How
many 1 ft2 tiles fit across the bottom of the
triangle?
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Area of a Triangle If we continue to build the
triangle with rows of 10 ft2, what happens?
10 ft
How tall is the triangle? How can you tell?
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How does this help us find the area of the
triangle?
4 ft
10 ft
See that the rectangle we built is twice as large
as the triangle. How do you find the area of a
triangle?
Find the area of the rectangle, then divide by
2 20 ft2
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Is this true for all triangles? Let's see!
Calculating base(height) results in 2 triangles!
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The Area (A) of a triangle is found by using the
formula Note The base height always
form a right angle!
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Example. Find the area of the figure.
4 cm
10 cm
10 cm
6 cm
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Try These. Find the area of the figures.
20
13 ft
14
16
9 ft
12 ft
11 ft
15
9
73
Find the area.
10
74
Find the area