for known 2 sides and included angle, use cosine theorem
a2=b2+c2-2bc cos(angle A)
for right-angled triangles, use Pythagoras's theorem
a2+b2=c2
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Perimeter of a triangle = (length of the first side) plus (length of the second side) plus (length of the third side)
One side is not enough. For a right triangle the third side can be calculated by Pythagoras' Theorem if you know the length of any two sides.
no it can not be eaual but it can be greater than The sum of the lengths of any two sides of a triangle is greater than the length of the third side.
The length of the other side can be anything between 12 and 68 feet
The length of the third side must be greater than the difference between the length of the two given sides and it must be less than the sum of the two given sides. These limits can be derived from the fact that any two sides of a triangle must have a combined length greater than the third side.