Cuál es el perímetro de una rueda de bicicleta cuyo diámetro es de 40 cm?

boxplot e is the answer

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!