90 Degree and 180 Degree

45 Degree and 225 Degree

180 Degree and 270 Degree

270 Degree and 360 Degree

pitch circle

base circle

pitch curve

prime circle

Right

Wrong

(a) primary forces and couples must be balanced

(b) secondary forces and couples must be balanced

both (a) and (b)

none of these

P = W tan(? - ?)

P = W tan(? + ?)

P = W tan(? - ?)

P = W cos(? + ?)