What is the length of DF rounded to the nearest tenth?

Question

What is the length of  DF rounded to the nearest tenth?

anonymous · Answer

attachment

anonymous · Answer

Can anyone help me? @tiaph  @Hero @karatechopper

anonymous · Answer

Err are you given any other piece of information? It is currently unsolvable at the moment.

anonymous · Answer

how is it unsolvable?

anonymous · Answer

how are the 2 triangles related to each other? are they congruent or something?

anonymous · Answer

Yes they want to find the length of DF! :)

anonymous · Answer

Since they are congruent triangles DF = AB. then you can proceed to solve from there. Do you know how?

anonymous · Answer

No, im afraid not :(

anonymous · Answer

Given two points (a,b) and (c,d)
The way to find the length is as follows:
Length = sqrt( (a-c)^2 + (b-d)^2)

So in this case (2,4) and (-1,-1).

Length = sqrt( (2-(-1))^2  + (4-(-1))^2) = sqrt( 3^2 + 5^2 ) = sqrt( 9+25) = sqrt(34)

anonymous · Answer

Thanks:)