(X1-X2) + (Y1-Y2)
both pairs of parentheses are squared. if that makes sense. ()2. the entire equation is underneath a square root.
if this helped good. if not I'm sorry I confused you further.
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
30/70
all you have to do is flip it