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Faman39

  • 3 years ago

What is the surface area of the composite figure? 176 mm2 192 mm2 208 mm2 304 mm2

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  1. Faman39
    • 3 years ago
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  2. freewilly922
    • 3 years ago
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    You have 4 triangles with Height = 3mm and base = 8 mm and 5 rectangles with base= 8mm and height=2mm Do you know the area of a triangle with respect to base and height? ditto with rectangles?

  3. freewilly922
    • 3 years ago
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    Sorry 4 rectangles

  4. Faman39
    • 3 years ago
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    Sorry but i still could not get this, how to solve ?

  5. Faman39
    • 3 years ago
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    @ghazi can you able to help me with it?

  6. ghazi
    • 3 years ago
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    its easy you can do it, it is sum of surface areas

  7. freewilly922
    • 3 years ago
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    Triangle area is 0.5 B H so (3)(8) = 24 mm squared but there are 4 so (24)(4) mm squared for the roof. For rectangles area is BH so (8)(2) = 16 but we have 4 so (16)(4) the total surface area would be then the sum from the roof and the sides or (24)(4) + (16)(4) = (38)(4) = 152 mm squared

  8. Faman39
    • 3 years ago
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    Thank you so much guys :)

  9. ghazi
    • 3 years ago
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    it's 4*(8*2)+(8*8)+4(2*1/2*4*3)

  10. Faman39
    • 3 years ago
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    Thanks alot guys! :)

  11. freewilly922
    • 3 years ago
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    forgot the halves in the triangle calculation. Triangle area is 0.5 B H so 0.5(3)(8) = 12 mm squared but there are 4 so (12)(4) mm squared for the roof. For rectangles area is BH so (8)(2) = 16 but we have 4 so (16)(4) the total surface area would be then the sum from the roof and the sides or (12)(4) + (16)(4) = (28)(4) = 112 mm squared plus 64 for the bottom to get 176 mm squared

  12. Faman39
    • 3 years ago
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    :) thanks @freewilly922 and @ghazi !! you guys are truly very awesome!!!!!!

  13. ghazi
    • 3 years ago
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    you're welcome

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