Question

The length of the sub-tangent, ordinate and the sub-normal are in

• A. A.P.
• B. H.P.
• C. G.P
• D. Arithmetico geometric progression

Answer 1

Answer: (C)

G.P

Answer 2

$\because$ Subtangent $=y \times \frac{d x}{d y}$
and subnormal $=y \times \frac{d y}{d x}$
$\therefore$ Subtangent $\times$ subnormal $=y^{2}=(\text { ordinate })^{2}$
Hence, length of the subtangent, ordinate and the subnormal are in GP.