Static Shock, Season 3

Mr. MacGill:
Now, the first step in solving this... (he sees Richie engrossed in his notebook) Mr. Foley? ... Mr. Foley? [Richie still reads through his notebook] MR. FOLEY?

Richie:
(finally looks up) Huh?

Mr. MacGill:
(points at the equation) The problem?

Richie:
(Richie adjusts his glasses and takes a glance at the ten-line-long equation of mathematical gibberish for five seconds and...) Four over pi.

Mr. MacGill:
Perhaps, Mr. Foley, if you had been paying atten- (realizing) What?

Richie:
The answer. Four over pi.

Mr. MacGill:
Y-yes, but ... how did you know?