You cannot because the polygons are invisible!
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A "protractor" is a device that can be used to draw angles of a specified size, or measure the size of unknown angles, in the same way that a "ruler" is used to do the same thing with lines.
Congruent polygons.
Congruent polygons.
You will use what you know about the triangle, including the size of sides or angles of that specific triangle, plus properties of any special category of triangles of which it is a member, to calculate the unknown height.
Similar polygons have congruent angles and the same shape (but not necessarily the same size). Since the shape of a square and a rectangle is different from the shape of a trapezoid, they are not similar to it.