18.
It is 2.5 times the length of FG. Since the latter length is not given, it is not possible to provide a more comprehensive answer.
The difference between 72 and 16
S, O, and N. They are the first letters of the months of the year.
There are infinitely many possible answers. 16+16, 15+17, ... , 1+31, 0+32, -1+33, -2+34, ... , and so on. 15.9+16.1, 15.8+16.2, and so on 15.99+16.01, 15.98+16.02, and so on 15.999+16.001 and on, and then with 4 decimal places, 5, 6 and so on. Next, you can look at additions of 3 numbers, 4 number, ... each of which gives infinitely many possible answers.
fgh fghf gh fghf hfg hfgh fgh fgh fgh fhf hf hhe deg rd
in ghfh fgh in ghfh fgh
fttjnttjhthj hdttd tdh thfgh fghghfgh g fh gfh fgh gghh fgh gh fgh g hg hg h hg h fgh fg hg fh fh fgh fgh fgh gh gt\h]t r\y]tryt\ry\t] yt]y\t]\y]t\y]\t]y\]t\y]t\]y\t]y\t]y\t
fgh
Hvghghc,the fgh,see
NO
The shortest side of a triangle is opposite to its smallest angle
fgh fghf gh fghf hfg hfgh fgh fgh fgh fhf hf hhe deg rd
18.
In a triangle the shortest side is opposite to the smallest angle and the largest side is opposite to the biggest angle.
a scalene triangle, the shortest side is GH
fgh