Answer:
30°
Step-by-step explanation:
First angle = 120°
Remaining two angles would be congruent.

Answer:
b
Step-by-step explanation:
Sinα=cos(90-α) this is an identity which you need to know...
in this case:
sin49°=cos41°
If you are taking the cm to km then it would be like this
4.5km*4.1cm= 18.45km