/usr/lib/pd/extra/hcs/pi.pd is in pd-hcs 0.1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | #N canvas 460 247 298 274 10;
#X obj 36 56 inlet;
#X obj 82 185 outlet;
#X obj 82 98 bang;
#X obj 122 56 loadbang;
#X text 15 17 bang to get the value of pi;
#X msg 82 120 1;
#X obj 82 142 atan;
#X obj 82 164 * 4;
#X connect 0 0 2 0;
#X connect 2 0 5 0;
#X connect 3 0 2 0;
#X connect 5 0 6 0;
#X connect 6 0 7 0;
#X connect 7 0 1 0;
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