It means like what number equals that number.Use multiplication to figure these out.
Example : 9,15. Factors for 9-9,1,3 .Factors for 15-1,15,3,5
Hope this helps !
Using cosine rule, the length of the required side = sqrt(32^2 + 35^2 - 2 x 32 x 35cos 120)
= sqrt(1024 + 1225 - (-1120))
= sqrt(2249 + 1120)
= sqrt(3369)
= 58.04