“Parabolic Segment”的概念、定义、习题解题方法及翻译-数学辞典

单词

Parabolic Segment

释义

Parabolic Segment

The Arc Length of the parabolic segment shown above is given by

(1)

The Area contained between the curves

			(2)
			(3)

can be found by eliminating

(4)

so the points of intersection are

(5)

Therefore, for the Area to be Nonnegative,

, and



			(6)

so the Area is


			(7)

Now,


			(8)


			(9)




			(10)

We now wish to find the maximum Area of an inscribed Triangle. This Triangle will have two of itsVertices at the intersections, and Area

(11)

But

, so


			(12)

The maximum Area will occur when

(13)

But

			(14)
			(15)

(16)

and

(17)

Working on the third term



			(18)


			(19)

(20)

and



			(21)

which gives the result known to Archimedes

in the third century BC

that

(22)

The Area of the parabolic segment of height opening upward along the y-Axis is

(23)

The weighted mean of

(24)

The Centroid is then given by

(25)

See also Centroid (Geometric), Parabola, Segment

References

Beyer, W. H. (Ed.) CRC Standard Mathematical Tables, 28th ed. Boca Raton, FL: CRC Press, p. 125, 1987.

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