A student solved the following problem and made an error.

Triangles ABC and DEF. Angles A and F are congruent and measure 135 degrees. Coordinate for A 0, 2; B 2, 4; C 0, 0; D 2, 0; E 4, 4; F 4, 2.

Line 1

Line 2

∠A ≅ ∠F
Line 3

Length of .
A (0, 2)
B (2, 4)
= 2.83
Line 4

Length of .
D (2, 0)
E (4, 4)
= 4.47
Line 5

Line 6

by SAS

In which line did the student make the first mistake?

Line 2

Line 5

Line 3

Line 4

Question

A student solved the following problem and made an error.
 
Triangles ABC and DEF. Angles A and F are congruent and measure 135 degrees. Coordinate for A 0, 2; B 2, 4; C 0, 0; D 2, 0; E 4, 4; F 4, 2.
 
Line 1
	
Line 2
	
∠A ≅ ∠F
Line 3
	
Length of .
A (0, 2)
B (2, 4)
 = 2.83
Line 4
	
Length of .
D (2, 0)
E (4, 4)
= 4.47
Line 5
	
Line 6
	
by SAS
 
In which line did the student make the first mistake?

Line 2

Line 5

Line 3

Line 4

anonymous · Answer

I want to say Line 3, but I don't understand it. Is there anything else stated about it?