WAEC - Mathematics (1997 - No. 31)
TR is the tangent to the circle PQR with centre O. Find the size of ∠PRT
44o
46o
60o
74o
118o
Erläuterung
Reflex < POQ = 360° - 148° = 212°
< PRO = 360° - 330° = 30°
But < ORT = 90° \(\implies\) < PRT = 90° - 30° = 60°