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Assuming the figure is a plane regular rectangle.
Then there are two sides of 20m and two sides of 9m .
We could then write 20 + 20 + 9 + 9 = 58m
However we can alter this to (2 x 20) + ( 2 x 9) = 40 + 18 = 58m
or we could say 2*(20 + 9) = 2(29) = 58m.
However, you only mention two sides. you must specify the shape of the figure, be it a triangle, rectangle, kite. Trapezium and Square are discounted because a trapezium may have difference lengths ( an asymmetric trapezium), and a square has has four sides all the same length.
Then again the polygon might be of irregular shape( four different lengths).
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