An isosceles triangle inscribed in a circle. How should this be accomplished if triangle’s area is maximized?!?

An isosceles triangle is placed inside a circle of radius r with its vetices on the boundary of the circle. How should this be accomplished if the area of the triangle is to be maximized?

This problem relates to using derivatives… I have no idea what to do or how to set it up.. can someone please help? Thank you so much!

Draw a triangle in a circle with a height greater than the radius. The height is r+x.
The 1/2 of the base is sqrt(r^2 – x^2).
The area is A = (1/2) b h = (r+x)*sqrt(r^2 – x^2)

The max area occurs when dA/dx =0

Compute the derivative and solve for the value of x as a fraction of r or simply let r=1.

One Response to “An isosceles triangle inscribed in a circle. How should this be accomplished if triangle’s area is maximized?!?”

  1. Draw a triangle in a circle with a height greater than the radius. The height is r+x.
    The 1/2 of the base is sqrt(r^2 – x^2).
    The area is A = (1/2) b h = (r+x)*sqrt(r^2 – x^2)

    The max area occurs when dA/dx =0

    Compute the derivative and solve for the value of x as a fraction of r or simply let r=1.
    References :

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