SOLUTION: If all three iron bars have a width of 5cm and a length of 20 cm, which iron bar weighs the most? a) a hexagonal prism-shaped iron bar b) a rectangular prism-shaped iron bar c

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Question 1161454: If all three iron bars have a width of 5cm and a length of 20 cm, which iron bar weighs the most?
a) a hexagonal prism-shaped iron bar
b) a rectangular prism-shaped iron bar
c) a triangular prism-shaped iron bar
Thanks in advance!
Answer by ikleyn(52818)   (Show Source): You can put this solution on YOUR website!
.

That iron bar has the maximum weight, whose perpendicular section has the maximum area, under given condition.


Everybody having a bit of imagination will get that the rectangular prism-shaped iron bar has the maximum perpendicular section,
under given condition.  //  which is a SQUARE prism-shaped, in this case.



    Simply because other shapes are INSCRIBED into the square shape perpendicular section



Hence, . . .  // and you can make a simple logical conclusion on your own . . . 


ANSWER.  The rectangular prism-shaped iron bar.  //  which is a SQUARE prism-shaped, in this case.


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