Maru wa medama
Maru wa kirei
Kuroi budou no
Amai aji

Sankaku wa jikan
Sankaku wa hayai
Sakana no shippono
Furuekata

Shikaku wa sora
Shikaku wa hiroi
Hana wo kandera
Ii ni ooi

3.14159 2653589 7932384
626433 8327950 2884197 1693993
751582

Translation:
Circle's an eye ball
Circles are pretty
A wonderful taste
just like black grapes

Triangle's a moment
Triangles are fast
The fish's tail
trembles

Square's the sky
Squares are wide
Flowers are good to chew
it's good that there are many

3.14159
2653589
7932384
626433
8327950
2884197
1693993
751582

See also:
JustSomeLyrics
77
77.63
OT3 Ramon Para llenarme de ti Lyrics
Alessandro Fiorello Stai Con Me Lyrics