Question

Given that Triangle ABC is congruent to triangle DEC find the value of x. If necessary, round your answer to two decimal places.

Answer 1

use the proportionalitie of coresponding sides 

63+x       x+3
-------- = -------
  36           6


63 +x = 6(x+3)

63 +x = 6x +18

63 -18 = 6x -x

45 = 5x

x = 45/5

x = 9