Question 1151990
The 2 sides have an area:
{{{ 2*3*.5 = 3 }}} m2
The top and bottom add up to:
{{{ 2*2*.5 = 2 }}} m2
The total area adds up to:
{{{ 3 + 2 = 5 }}} m2
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The cost of these materials is:
{{{ 5*3 = 15 }}} 
$15
The best estimate may include some waste
after cutting boards to length, but that
waste is unknown.