Question

please answer this question​

Answer 1

Explanation:

Construction.

Join A to center O

And the angle OAT = 90 degree(angle by tangent)

Therefore In triangle AOT, angle OAT=90 degree

OA/OT=Sin30 degree

OA/4=1/2 (Sin 30 degree =1/2)

2OA=4

OA=2cm.

so. radius OA=2cm

Answer 2

Answer:

as we can see in the OT is 4 cm and makes 30'

sin 30 = opp / hyp

1/2 = OA/4

hence answer is 2