Encontrar el radio de una circunferencia tal que un arco de 3.66 dm de longitud subtiende un ángulo central de 30 grados

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.

The answer is 9.7 cm