Computing Volume from Cross-Sectional Area

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SUMMARY

The volume of the attic can be computed by integrating the cross-sectional areas of the rectangular and triangular sections. The rectangular section measures 30 feet by 60 feet, yielding a constant area of 1800 square feet. The triangular section, with a base of 30 feet and height of 10 feet, has an area of 150 square feet. By slicing the attic into one-foot thick slabs, the total volume can be calculated by multiplying the area of the rectangular base by the height of the attic and adding the volume contributions from the triangular sections.

PREREQUISITES
  • Understanding of integral calculus
  • Familiarity with geometric volume calculations
  • Knowledge of cross-sectional area concepts
  • Ability to visualize three-dimensional shapes
NEXT STEPS
  • Study the principles of volume integration in calculus
  • Learn how to compute areas of various geometric shapes
  • Explore applications of cross-sectional analysis in real-world scenarios
  • Investigate methods for setting up integrals for complex shapes
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Students in mathematics or engineering fields, educators teaching geometry and calculus, and anyone involved in architectural design or structural analysis.

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Homework Statement


A house attic has rectangular cross sections parallel to the ground and triangular cross sections perpendicular to the ground. The rectangle is 30 feet by 60 feet at the bottom of the attic and the triangles have base 30 feet and height 10 feet. Compute the volume of the attic.


Homework Equations





The Attempt at a Solution



I know how to solve this once it is set up as an integral, but I am having trouble setting up the integral itself.
 
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An integral is overkill. Think of slicing the attic into triangular slabs, each one foot thick. What is the volume of each slab? How many slabs are there?
 

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