Number of circles through a pair of given points
PN is a secant intersecting a circle at points M and N such that PN > PM. A tangent PT is drawn to the circle touching it at T. If PM = 32 cm and PT = 40 cm, what is the length (in cm) of the chord MN?
Two intersecting circles are said to be orthogonal if the angle between them is a/an _________.