Question

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. 

Answer 1

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