There is no standard formula. The answer will depend on the compound shape and also on which of the lengths (or angles) are known.
It is the same length as the corresponding side on the other triangle.
You'd have to know some relationship, formula, equation etc. among the angles and the lengths. There would be many relationships to choose from if the items you mention are the parts of a triangle, but if they are, you've kept it a secret.
Missing information must be found.
It depends on which side is missing. If the hypotenuse (longest side, opposite right angle) is missing, square the lengths of the other two sides, add them, and then square root your answer. If a leg is missing, square the two remaining sides, subtract the smaller from the larger, and square root it. All of this is derived from the Pythagorean Theorem: a^2+b^2=c^2, where a and b are the lengths of the two legs and c is the length of the hypotenuse.
It all depends on what information you DO have. If all you have is two lengths, then all you can say is that the missing side is greater than the difference between the two and less than the sum of the two.
If you have the lengths of all three sides than ÐA = cos-1[(b2 + c2 - a2)/2bc] where a, b and c are the lengths of the sides and A is the angle opposite side a.
The study is called trigonometry.
(black/red=squares) X 83
It is the same length as the corresponding side on the other triangle.
Add all angles together and minus from 360 degrees
Surely you know how to find the third side of a right triangle, when you know the lengths of the other two. Find it, and then add up the lengths of the three sides to get the perimeter.
One way to find a missing side length of a triangle is to use the Pythagorean theorem, which states that in a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides (a² + b² = c²). If you know the lengths of two sides, you can rearrange the formula to solve for the missing side. For example, if you have the lengths of the two legs (a and b), you can find the hypotenuse (c) by calculating c = √(a² + b²).
3 hight
You would look at the side lengths and the scale factor to find a pair of similar figures :)
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.
You'd have to know some relationship, formula, equation etc. among the angles and the lengths. There would be many relationships to choose from if the items you mention are the parts of a triangle, but if they are, you've kept it a secret.
Missing information must be found.