Getting Clojure: 'compute-area' does not compile (page 89)

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The top of page 89 states:

and we also got the calculation wrong:

user=> (defn compute-area [diameter]
  #_=> (* PI radius (/ diameter 2.0)))
#'user/compute-area

The code above does not compile:

Unable to resolve symbol: radius in this context

The intended code is probably something like:

(defn compute-area [diameter]
  (let [radius (/ diameter 2.0)]
    (* PI radius radius)))