p=36
because 15 is 3 times 5 so just multiply the perimeter
Step 
<u>Find the length of the side MN</u>
we know that
Applying the Pythagorean Theorem

Solve for MN

in this problem

Substitute in the formula above



Step 
<u>Find the value of cos (M)</u>
we know that
in the right triangle MNL


Substitute



therefore
The answer is
The value of cos(M) is equal to 
Answer:
(-1,5)
Step-by-step explanation:
Take the Distance between B and M which is 2 up and 2 across. with that and following the information where M is a midpoint follow the patter of 2 up and 2 across to get A