Step-by-step explanation:

Answer:
A, 6
Step-by-step explanation:

<em>subtract</em>
from both sides

<em>divide</em> both sides by 

<em>plz mark me brainliest</em> ;)
Answer:
Yes, they are congruent
Step-by-step explanation:
Two figures are congruent if they have the same side lengths and the same angles, all in the same order. (I mean "same order" by you couldn't have a rectangle and a kite with different orders of the sides being congruent). Now, if we use this, we can compare the sides and angles to find out that they are indeed congruent.
Answer:
No
Step-by-step explanation:
I don't think it is proportional
Coplanar points are three or more points that lie on the same plane.