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How do you find perimeter of a triangle if length of one side is not known?
Wiki User
∙ 13y ago
Pythagorean Theorem- a2+b2=c2
Then add up all of the sides and you get the perimeter.
LOOPDOP says:
Previous answer will only be correct for a right angled triangle where c= the hypotenuse.
For other triangles it is a bit more complicated.
You will need to now the angle between the two known lengths.
a and b are the two known lengths
C is the angle between a and b
length of third side = the square root of {a2 + b2 - (2ab x cos C)}
Wiki User
∙ 13y ago
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How do you find Ares and perimeter on a tringle?
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