Answer:
A
Step-by-step explanation:
given that ST is a diameter, then
∠ TRV and ∠ SRV are a linear pair and sum to 180° , that is
∠ TRV + ∠ SRV = 180° , then
∠ TRV + 55° = 180° ( subtract 55° from both sides )
∠ TRV = 125°
because the ST is diameter
the SRV+VRT will be 180°
as SRV=55
so VRT will be 180-55=125
so ans will be 125
