It is known that the focal coordinates of two parabolas are (2,0), (0,2), and the standard equations of them are obtained

When the focal coordinate of the parabola is (2,0)
p/2 =2
p=4
y^2=2px
y^2=8x
Similarly: when the focus coordinate of the parabola is (0.2), x ^ 2 = 8y

What is the pressure angle on the base circle of involute gear?

The pressure angle on the base circle is 0
There is no involute in the base circle. The pressure angle is the angle between the motion direction of the involute and the force direction. The pressure angle of each point on the involute is different. The farther away from the base circle, the greater the pressure angle
The pressure angle on the base circle is 0, and the pressure angle on the dividing circle is 20 degrees

An involute standard spur gear, M = 3mm, z = 20, then its pitch circle diameter is

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