What is the modulus unit of involute gear and what is the standard pressure angle of involute cylindrical gear

The unit of module of involute gear is mm; the standard pressure angle of involute cylindrical gear is 20 °

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11. How to understand the gear involute equation of proe r = 36 theta = t * 45 x = R * cos (theta) + R * sin (theta) * theta * pi / 180 y = R * sin (th)
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13. Function of involute equation parameters of gears The two equations are as follows: Fang Chengyi angle=t*45 x=r*cos(angle)+pi*r*angle*sin(angle)/180 y=r*sin(angle)-pi*r*angle*cos(angle)/180 z=0 Fang Chenger afa=60*t x=r*cos(afa)+pi*r*afa/180 * sin(afa) y=r*sin(afa)-pi*r*afa/180 * cos(afa) z=0 In the two equations, angle = t * 45 and AFA = 60 * t are used to adjust the length of the involute, but the shape of the involute, that is, the shape of the gear, is unchanged, only the extension length of the involute is changed: if the value is set smaller, it may appear that the involute can not intersect the addendum circle, but the shape of the involute remains unchanged after changing the value?
14. It is known that the standard equation of parabola is a straight line x = - 2, and the focus is f (2,3). According to the definition of parabola, the equation of this parabola is obtained
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