Q: What do you do to find missing sides are known?

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You cannot. The missing side can have any value greater than 0 and less than the sum of the five known sides - and there is no way to know which.

That will depend on how many sides the polygon has.

Yes, but it is totally pointless since all three sides (legs) are known to be the same.

The answer depends on what information you do have and what is missing. There is no single answer for all situations.

a=360 ___ n i think this is true sorry if it isn't

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You cannot. The missing side can have any value greater than 0 and less than the sum of the five known sides - and there is no way to know which.

In order to find the perimeter of a 3D rectangle you must gather the lengths of the known sides, calculate the missing rectangular values, and use the formula for perimeter.

That will depend on how many sides the polygon has.

Yes, but it is totally pointless since all three sides (legs) are known to be the same.

The answer depends on what information you do have and what is missing. There is no single answer for all situations.

a=360 ___ n i think this is true sorry if it isn't

The answer depends on what number is missing and what numbers are known!

180 minus two known angle = missing angle. Use Pythagoras' theorem to find its missing side.

The way to find the missing side of a triangle-THIS ONLY WORKS ON RIGHT ANGLED TRIANGLES-is square both sides seperately and then add them together to give you the square of the missing side-find the square root and that is the size of the missing side-eg. if you have a RIGHT ANGLED TRIANGLE with sides of 3inch and 4inch then (3x3) + (4x4) = 25 so the square root of 25 is 5 meaning the missing side is 5inch.

Subtract the two known angles from 180 degrees will give you the missing angle

If there is no length for the hypotenuse you have to use the Pythagorean Theorem. If there are two sides missing and a reference angle you could use Trigonometry.

To create a triangle, the sum of the two shorter sides must be greater than the third side. If the longest side is one of the two given sides, then the missing side must be greater than the difference between the two shorter sides. If the missing side is the longest side then the missing side must be less than the sum of the two shorter sides.