Question

How many radians are in one degree, accurate to three decimal places?

Answer 1

Now, if you recall, there are 180° in π radians, now, so how many radians in 1°?

$\bf \begin{array}{ccll} de grees&radians\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 180&\pi \\ 1&r \end{array}\implies \cfrac{180}{1}=\cfrac{\pi }{r}\implies r=\cfrac{1\cdot \pi }{180}$