SOLUTION: D(5, 7), E(4, 3), and F(8, 2) form the vertices of a triangle. What is m DEF?

Algebra ->  Triangles -> SOLUTION: D(5, 7), E(4, 3), and F(8, 2) form the vertices of a triangle. What is m DEF?       Log On


   

Question 860188: D(5, 7), E(4, 3), and F(8, 2) form the vertices of a triangle. What is
m DEF?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

D(5, 7), 

E(4, 3) m = +highlight_green%284%29 DE = sqrt%284%5E2+%2B+1%5E2%29

F(8, 2)m = +highlight_green%28-1%2F4%29  EF = sqrt%281%5E2+%2B+%28-4%29%5E2%29

DE perpendicular to EF and DE = EF

m DEF is  90°