If time is plotted on the x-axis and units of price is plotted on the y-axis, then the geometric angle at following points will be :

Price x timeGeometric angle

1x226.5

1x145

2x163.5

4x175

Now if units of time =1 and units of price =1 1/4 then the following geometric angles are obtained:

Price x timeGeometric angle

1x232

1x151

2x168

4x179

The solution to the above angles is:

Let x = time, y = price and = geometric angle

Then by definition of the trigonometric function (tangent function) we have

tan = y / x

= tan -1 (y / x)

Now if the price range = 26220 to 30360 (y = 4140). the time range is from 9/1/1988 to 12/30/1988 (x = 120 days).The 1x1 angle = 33 degrees. The 1x2 angle =18 degrees. How do you calculate these angles ? Any help will be appreciated.