Answer:a+b=125°.
Step-by-step explanation:
Measure of arc which makes an angle of 90 °at centre is 90° as intercepted arc measures the same as central angle .
Measure of remaining arc = 360-(90+110)=360-200=160°.
b= 160÷2=80° as An Angle formed by a chord and a tangent that intersect on a circle is half the measure of the intercepted arc .
Measure of a= 90÷2=45°(angle made on circumference is half the angle made at center)
a+b=45+80=125°
