In the given diagram, the points a, b, and c lie on a circle whose center is o. boc is a diameter of the circle.

the following set of premises is relevant to the investigation of the given geometric diagram:

i. the radii of a circle are of equal length.
ii. angles opposite to equal sides of a triangle are equal.
iii. the sum of the angles of a triangle is 180°

with reference to the diagram, which conclusion can be drawn correctly from the premises?