Question

angle in a semicircle ​

Answer 1

angle in a semicircle is 90°

as per the diagram

u can see that a circle with centre O

and AB is diameter

ACB is semicircle

so, angleAOB=180°

and ACB is angle in sector

also angleAOB=2angleACB

180°=2angleACB

180°/2=angleACB

90°=angleACB

Answer 2

Answer:

Angle in a semicircle is a right angle