Find the perimeter of the given trapezoid

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Find the perimeter of the given trapezoid

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(The diagram is not drawn to scale)

I thought I could use the pythagorean theorem, but I have two unknow sides. What do I do now??

Thank you

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I assume it's an isosceles trapezoid: Draw another height with length $6$. The bottom will be $2x+3$ which is $8$. While $x=5/2$ it is not difficult to see you have $5k-12k-13k$ triangle. So the hypotenuse will be $13/2$. Now you can calculate the perimeter.