CSEC Past Paper - Surface Area and Volume - May 2017

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This is an educational video on Surface Area and Volume. CSEC Past Papers, May 2017.
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For the third question I worked it differently and got the same answer:

Length x Perimeter of triangular base (sum of sides) + Base x Height
22.5 x 24 + 6 x 8
540 + 48 = 588cm^2

TheDoll-se