Question

find angle abc and angle eaf

Answer 1

Angle abc is 90 (angle in semi circle)

Angle a+b+c+d=360

A+ 90+90+75=360

A=360-255

A =105

So eaf = 105 (vertically opposite angle)

Answer 2

as angle made in semi circel is always 90 degree. Hence angle ABC and ADC are 90 degree.And angle bad and eaf are 115 degree.