years Anniversary In fig. 12-21, 0 is the centre of the circle and TA is a tangent at A. Use Fig. 12-21 to answer the following a- If AOC = 86°, calculate LAT b- It A TO = 36°, Calculate Año C. If OAC = 69°, calculate A ÎC d´I ACT = 122°, calculate CÂT​