FrozenCrash/Zadachi — comment on commit bf4f153a03f54b451dc38ab727c2beaad7a6c2fc
File: 2.rb line 12
By FrozenCrash:

Write how

pi = Math::PI

and then use "pi" ?
how this ?
=>
=>
pi = Math::PI
s = pi*3*(r2+r2) + pi*(r2**2+r1**2)
?