Complete the proof of the exterior angle theorem imgbomb.com/i/?Qc6rj

Question

563blackghost · Answer

Reason1 is Given.

563blackghost · Answer

Due to the fact that $\large\bf{ \angle 3}$ and $\large\bf{\angle4}$ form a linear pair this would be determine by the `definition of linear pair`.

Now a straight line has a degree of `180` so the linear line has a degree of `180`. Due to the two angles lying on the line and making the linear line they are `supplementary angles` in whose angles add up to 180. So for `Reason3` it would be `definition of supplementary angles`.

uberstudy · Answer

@563BlackGhost Thank you, I kind of understand how to answer this one now, do you know anything about this one? 
	Compare properties of squares and rhombi to properties of other quadrilaterals by answering each question. Write a brief explanation for each answer.
(a)	Describe a property of squares that is also a property of rectangles.
(b)	Describe a property of squares that is not a property of rectangles.
(c)	Describe a property of rhombi that is also a property of parallelograms.
(d)	Describe a property of rhombi that is not a property of parallelograms.