I thin kthe answer your looking for is Vertical angles. Hope i helped! Brainliest?
and i know its ccorect becuase because the interior angles of vertical angles are congruent.
to get the equation of any straight line, we simply need two points off of it, let's use the ones provided in the picture below.


Answer:
DF = 7.5
Step-by-step explanation:
Since the 3 sides are congruent, then
EF = DE , that is
4.5m - 42 = 1.5m - 9 ( subtract 1.5m from both sides )
3m - 42 = - 9 ( add 42 to both sides )
3m = 33 ( divide both sides by 3 )
m = 11
Thus
DE = 1.5m - 9 = 1.5(11) - 9 = 16.5 - 9 = 7.5
Then
DF = 7.5
The answer is
6(10x-1)(x-1)