a)Measure of full arc in a circle is 360 degree.
Measure of arc EFG = 298 given.
So Measure of arc EG= 360-298=62 degrees.
An Angle formed by a chord and a tangent that intersect on a circle is half the measure of the intercepted arc
<GEH= half of intercepted arc EG
<GEH= Half of 62=31 degeees.
<GEH=31 degrees
b)Tangent makes an angle of 90 degree with radius or diameter.
In figure <HEF=90 degrees
<FEG=<FEH-<GEH
<FEG=90-31=59 degrees
<FEG= 59 degrees