<PRE><B>Question 174692</B>
{{{A=(h/2)(b[1]+b[2])}}} Start with the given area of a trapezoid formula.



{{{A=(5.25/2)(12.75+9.50)}}} Plug in {{{h=5.25}}}, {{{b[1]=12.75}}}, and {{{b[2]=9.50}}}



{{{A=(2.625)(12.75+9.50)}}} Divide



{{{A=(2.625)(22.25)}}} Add



{{{A=58.40625}}} Multiply



Since the least number of significant digits is 3, this means our answer will have 3 significant digits. So the answer is 



{{{A=58.4}}} 



which means that the area of the trapezoid is roughly 58.4 square centimeters.




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