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Answer :

x=6

Step-by-step explanation:

using Pythagoras theorem

on small triangle

(2)^2 + b^2 = (√13)^2

4 + b^2. = 13

b^2 = 13- 4

b^2 = 9

b = 3

so x = 2× b

= 2×3

=6

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