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A triangular prism has cross section ADE as shown. BC//DE, BC=4cm and DE-6cm. If the prism has a length of 10cm and density of 1.32g/cm3. Calculate the mass of the prism of cross-section ABC. Given that the area of trapezium BCDE=36cm2

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L.S.F =2/3
A.S.F =4/9
  s=36cm2
 4×36 =28.8cm2
    5
Vol =28.8 ×10 =288cm3
  1cm3 =1.32
    288 × 1.32
     =380.16g

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