How do I do this? I don’t get it

1)since the question says in terms of theta , we'll only provide an expression

let ∆ be theta

∆ × 16π - 8sin∆

360

2)using the formula above and equating to 12 , the angle theta is 130°( approximately)

entering that problem on the tube might get you an answer

step-by-step explanation:

duck you