Question

in circle AB is a diameter and oc is radius. if masure angle ABC = 40,FIND angle AOC with solution

Answer 1

AB is the diameter which means it is half of radius.
We gat a triangle ABC with Oc as a radius.
Angle ABC is 40 , therefore angle OAC is also 40. Proving both the triangles congruent we get Angle ACO equal to angle BCO which is 100.
so Angle ACO is 90 (40+50=90 and 180-90=90)