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Find the Missing Side
Lengths of a Triangle
Finding the Height
of a Triangle
How to Find the
Length of a Triangle
Find the Area
of a Triangle
How to Find
the Angle of a Triangle
Find the Perimeter
of a Triangle
1:31
Khan Academy
Khan Academy
The area of a triangle is found by multiplying one half of the base by the height. In our example, the base is 18 and the height is 6. So, half of 18 is 9, and 9 times 6 equals 54 square units.
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