Answer:
5.28 if you round to the nearest hundredth. Drop a best answer and a like if it helped
Answer:
15 units
Step-by-step explanation:

d = 14.866
d = 15
a the side lengths must be = but only opposite angles must be = it COULD be a square but is could be many other things.
Express in simplest a+bi form: Square root of 1b + Square root of -1b

Lets simplify 
We know 

We cannot simplify 


So a + ib form is 