Question

The product of the lengths of sub tangent and subnormal at any point of a curve is equal to

• A. Square of the abscissa
• B. Square of the ordinate
• C. Constant
• D. None of these

Answer 1

Answer: (B)

Square of the ordinate

Answer 2

Sub tangent × sub normal

= $\frac{y}{dy/dx} \times y\frac{dy}{dx}$ = y² = square of ordinate