Which shaded region? are you talking about the region between the circle and square?
Answer:
An equation in the slope-intercept form will be:

Step-by-step explanation:
Given the points
Finding the slope between points




We know that the slope-intercept form of the line equation is

where m is the slope and b is the y-intercept.
substituting the values m=-1/2 and the point (4, -2) to determine the y-intercept i.e. 'b'.




substituting the values m=-1/2 and b=0 to determine the line equation in slope-intercept form


Thus, an equation in the slope-intercept form will be:

C, this class is really hard, if u need tutoring contact me
The midpoint lines are half the opposite side length.
Line DE is given as 7 , So Line F = 7 x 2 = 14
Line EF is given as 12, so Line D = 12 x 2 = 24
Line DF is given as 16, so line E = 16 x 2 = 32
The perimeter is the sum of the 3 sides:
Perimeter = 14 + 24 + 32 = 70