NCERT Class 12-Mathematics: Chapter –6 Application of Derivatives Part 17

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Long Answer (L.A.)

Question 25:

If the sum of the lengths of the hypotenuse and a side of a right angled triangle is given, show that the area of the triangle is maximum when the angle between them is


Let ABC be a triangle with



ABC triangle

ABC Triangle

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Also area of



Again differentiating w.r.t. in Eq. (v) , we get

Which is less than zero.

Hence, area of the right angled triangle is maximum, when the angle between them is