Definition :-
SPIRALS : IT IS A CURVE GENERATED BY A POINT WHICH REVOLVES AROUND A FIXED POINT AND AT THE SAME MOVES TOWARDS IT.
Construction
Step 1. With PO radius draw a circle and divide it in EIGHT parts. Name those 1,2,3,4, etc. up to 8
Step 2. Similarly divided line PO also in EIGHT parts and name those 1,2,3,-- as shown.
Step 3. Take o-1 distance from op line and draw an arc up to O1 radius vector. Name the point P1
Step 4. Similarly mark points P2, P3, P4 up to P8.
And join those in a smooth curve.
It is a SPIRAL of one convolution
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