If you mean find the helical angle, alpha, using the pitch, p, with a shaft of radius, R, at the root of the teeth then:
alpha= arctan( p /(2R) )
Otherwise, if you mean find the helical angle while designing a gear, it is quite complicated and requires the knowledge of various parameters such as the maximal torque, speed, material, etc.
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you find a straight angle across ur curtains
To find an acute angle you need to find out if it is less than 90 degrees.
You find the arc measure and then you divide it in half to find the inscribed angle
9o35'
Measure the outside diameter and subtract tooth height times two.