r is kept positive by varying thetaθ (radian), through negative
values. This drawing is clockwise, thetaθ will decrease but increase
in magnitude.
For this spiral graph, smaller magnitude for thetaθ gives higher r. .
Table for plotting points (r, thetaθ radian) for the spiral:
Scale for r = -5/thetar=−5θ: 1 mm = 1 radian = 57.3^o57.3o.
As a matter of convenience, thetaθ is entered in degrees
(r, theta ): ( 100 mm , -2.9^o ) ( 50 mm, -6.7^o) ( 10 mm, -28.75^o )(r,θ):(100mm,−2.9o)(50mm,−6.7o)(10mm,−28.75o)
( 5 mm, -57.3^o ) ( 2.5 mm, -114.6^o ) (1 mm, -286.5^o) (0.5 mm, -573^o)(5mm,−57.3o)(2.5mm,−114.6o)(1mm,−286.5o)(0.5mm,−573o)
For conversion of thetaθ degrees to radian, divide by 57.3.
