Question 267
Draw a Diagram.

The diagonal line will create a right triangle within the rectangle. The base will be 50 and the height of the triangle will be 180.  Since this triangle is a Right Triangle.  
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Pythagorean Theorem can be used
{{{a^2 + b^2 = c^2}}}

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{{{50^2 + 180^2 = c^2}}}

{{{c^2= 2500 + 32400}}}

{{{sqrt(c^2) = sqrt(34900)}}}

c ~ 186.82