Parametric triangle

Although there are discussions similar to my problem I cannot find a specific solution and would appreciate any advice.
I have created a parametric triangle where the length of the base line is determined by the height of the wall and the angle beta……At first I used an expression with x.cos(y) and then I found the trig component so I used that instead.
What I don’t understand is why I cannot control beta below a value of about 30 ……the slider reads 6 but the angle is clearly greater than that.
I must be restricting something somewhere but I cannot see where.
Any help would be much appreciated (11.4 KB)

Because you were using the ‘R’ output instead of ‘P’. (9.2 KB)

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thank you Joseph