# Show that in the parabola y^2 = 4ax, the radius of curvature at any point P is twice the part of the normal intercepted between the curve and the directrix.

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**normal**to the**parabola**y2=**4ax**,both drawn at ... - ...
**normal****intercepted****between**the**curve**and the**directrix**.**Show**... - ... of a
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