Given:
M(4,2) is the midpoint of AB and A(-5, -3).
To find:
The coordinates of B.
Solution:
Let the coordinates of point B are (a,b).
Midpoint formula:

M(4,2) is the midpoint of AB and A(-5, -3).


On comparing both sides, we get




And,




Therefore, the coordinates of point B are (13,7).
The perimeter is all the side lengths added up.
Add up all the side lengths:
6x - 4 + 6x - 4 + 12x + 3 + 12x + 3 + 14x + 13
Add all like terms.
50x + 11
The answer is C) 50x + 11 units
15/60=1/4=0.25
0.25*100=25
15/60 in % is 25%