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)
F (4, 2)

= 2.83
Line 5

Line 6
by SAS

In which line did the student make the first mistake?
Line 3

Line 5

Line 1

Line 2