$\"\"$

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The bulding construction as a concret section.

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Consider equation is $\"\"$ and $\"\"$ .

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(a)

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Find the area.

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Find the area of the face of the section superimposed on rectangular coordinate system.

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Observe the figure:

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The figure is symmetric about $\"\"$ -axis.

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The area of the face as rectangular shape is $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ square meters.

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The area is $\"\"$ sq-meters.

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$\"\"$

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(b)

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Find the volume of the concrete.

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Volume $\"\"$ .

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Substitute $\"\"$ in the volume formula.

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$\"\"$

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The volume of face of the section is $\"\"$ cubic-meters.

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$\"\"$

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(c)

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Find weight of the section.

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$\"\"$

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$\"\"$

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$\"\"$

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The weight of the face of the section is $\"\"$ .

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$\"\"$

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(a) The area of the face of the section is $\"\"$ sq-meters.

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(b) The volume of face of the section is $\"\"$ cubic-meters.

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(c) The weight of the face of the section is $\"\"$ .