ksphere←{               ⍝ Surface area of k-sphere.
    n←⍺+1               ⍝ dimension of enclosed k-ball.
    pi←(○1)*n÷2         ⍝ power of pi.
    n×(⍵*⍺)×pi÷!n÷2     ⍝ k-sphere surface area.
}

code_colours

test script

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