Mathematics

Question

Please help me, I'm trying to find total surface area!
Please help me, I'm trying to find total surface area!

1 Answer


  • Find the total surface area of the solid.


    The faces of this solid are

    1 rectangle  8 cm × 20 cm;

    1 rectangle  17 cm × 20 cm;

    1 rectangle  15 cm × 20 cm;

    2 triangular bases (right triangles). The area of each one is

    (8 cm × 15 cm)/2.


    Total surface area:

    A = 8 × 20 + 17 × 20 + 15 × 20 + 2 × [ (8 × 15)/2 ]

    A = 160 + 340 + 300 + 120

    A = 920 cm^2   <———    this is the answer.


    I hope this helps. =)

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