This math riddle relates to Roman Numerals where 19 is IXX, 1 is I, and 20 is XX. By removing I from IXX, you are left with XX.
19
........___ VI/X/IXX XC I That line over IXX is crucial. remove/ignore the dots...
IXX
Due to rules made during the Middle Ages, today we write out 19 in Roman numerals as XIX. But the Romans themselves would have probably wrote out 19 as XVIIII and then simplified it to IXX. In fact the Latin word for 19 is "undeviginti" which literally means one from twenty. Hence: IXX*IXX = -I*IXX + XX*IXX = +I-XX-XX+CCCC = CCCLXI (361) In Hindu-Arabic numerals: -1(-1+20) + 20(-1+20) = +1-20-20+400 = 361
To convert the second moment of area (Ixx) from steel to aluminum, you can use the ratio of their modulus of elasticity (E). The ratio of E for steel to aluminum is approximately 3:1. Multiply the steel Ixx by 3 to get an estimate of the equivalent Ixx value for aluminum.
This math riddle relates to Roman Numerals where 19 is IXX, 1 is I, and 20 is XX. By removing I from IXX, you are left with XX.
The number i is the imaginary unit, representing the square root of -1. When you square i, you get -1. So, i^2 = -1. Therefore, ixx would be equivalent to i^2 * x = -x, where x is any real number.
19
........___ VI/X/IXX XC I That line over IXX is crucial. remove/ignore the dots...
IXX
Due to rules made during the Middle Ages, today we write out 19 in Roman numerals as XIX. But the Romans themselves would have probably wrote out 19 as XVIIII and then simplified it to IXX. In fact the Latin word for 19 is "undeviginti" which literally means one from twenty. Hence: IXX*IXX = -I*IXX + XX*IXX = +I-XX-XX+CCCC = CCCLXI (361) In Hindu-Arabic numerals: -1(-1+20) + 20(-1+20) = +1-20-20+400 = 361
09012001
IXX is a simplified version of XVIIII which equals 19 But in today's notation of Roman numerals 19 is said to be XIX.
its a IXX hope it answers your question
19-6-2010 though today's modern convention is to write out 19 as XIX but the Romans themselves would have probaly used IXX
King Carolina IXX of England