A motorcycle’s wheels has 30 spikes on it. What was the angle between each of the spokes

Which shows the correct lengths of side c in both scales? scale 1: 45 m; scale 2: 60 m scale 1: 60 m; scale 2: 45 m scale 1: 36 m; scale 2: 27 m scale 1: 27 m; scale 2: 36 m mark this and return save and exit

Can someone me with these two circle theorem questions asap?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.