### Theory:

While constructing a triangle with a given measurement, it is necessary to remember the properties of a triangle which are as follow:
Property $$1$$: The sum of all the angles of a triangle is $$180°$$.

That is, $$∠A + ∠B + ∠C = 180°$$ (where $$∠A$$, $$∠B$$, $$∠C$$ are angles of a triangle.)
Property $$2$$: The sum of any two sides is always greater than the measure of the third side.

That is, $$x + y > z$$, $$x + z > y$$ and $$y + z > x$$.
Property $$3$$: The exterior angle of a triangle is equal to the sum of interior opposite angles.

That is, $$∠4 = ∠1 + ∠ 2$$. (Where $$∠4$$ is an exterior angle of $$\triangle ABC$$ and $$∠1$$, $$∠ 2$$ are interior opposite angle.)
Property $$4$$: In  a right angle triangle, $$(\text{Hypotenuse})² = (\text{Opposite side})² + (\text{adjacent side})²$$.

That is, $$AC² = AB² + BC²$$ (Where $$AC$$ is the hypotenuse, $$AB$$ is the opposite side, and $$BC$$ is the adjacent side to the given angle.)