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Maximum area of ​​a rectangle inscribed by an ellipse

ÀÛ¼ºÀÚ Uploader : billy ÀÛ¼ºÀÏ Upload Date: 2019-10-28º¯°æÀÏ Update Date: 2020-02-19Á¶È¸¼ö View : 327

Find the maximum area of ​​a rectangle that includes a point P on the ellipse and is parallel to the x and y axes, as shown.

The equation of the ellipse is :

x^2/a^2 + y^2/b^2 = 1

Using triangular substitution, the coordinate of the point P becomes (a*cos¥è, b*sin¥è), so the area of ​​the rectangle inscribed to the ellipse is :

A = 4*x*y = 4*a*b*cos¥è*sin¥è

Here, since 2*cos¥è*sin¥è = sin(2¥è),

A = 2*a*b*sin(2¥è)

Then, since sin(2¥è)¡Â1,

Amax = 2*a*b


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Amax = 2*a*b
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