A L=πdtanθ
B tanβ=`L/(πd)`
C θ+β=π
D d=`L/(tanθ)`
tanθ =`L/(πd) ` => L=πdtanθ ;tanβ=`(πd)/L `;θ+β=90°
A `tanθ =(2P)/(πD)`
B `tanθ =(P)/(πD)`
C `tanθ =(πD)/(2P)`
D `tanθ =(πD)/P`
`tan =L/(πD)` = `(2P)/(πD)`(雙線螺紋之導程為螺距之二倍)
A tan30° = `L/(πD)`
B tan60° = `L/(πD)`
C L =πD cot 30°
D L =πD cos 30°
A 5/π
B 4/π
C 1/5π
D 1/10π
tanθ=`L/(πD)` =`(2P)/(πD)` = `(2*2)/(π*20)` = `1/(5π)`
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