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The strength of a member determines how much stress it can take and stress=[moment*distance from fibre of member to centroid of member]/2nd moment of area of member.The larger the 2nd moment of area of member the smaller the stress on the member (i.e. the stiffer the material).
Every shape has its own 2nd moment of area and that determines how stiff or how resistant the material is to stresses.
For example the trapezoid has a lower neutral axis and thus has a larger compressive stress acting on it than tensile ones so choosing a material which is strong in compression and moulding it to trapezoidal shape could make a good combination for strength.
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