Answer:
AB = 90° , AC = BC = 135°
Explanation:
the arc AB is equal to the measure of the central angle it subtends, then
AB = 90°
the sum of the arcs in a circle = 360° , then since AC and BC are congruent
AB + AC + BC = 360° ( since AC = BC ), then
90° + 2AC = 360° ( subtract 90° from both sides )
subtract 90° from both sides
2AC = 270° ( divide both sides by 2 )
AC = 135°
since AC = BC , then
AC = BC = 135°