Characteristic impedance calculation of a transmission line

http://en.wikipedia.org/wiki/Characteristic_impedance

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Sorry for the trouble guys, Finally i googled it out. I am pasting the formula for users understanding. Short For the case of a shorted load (i.e. ZL = 0), the input impedance is purely imaginary and a periodic function of position and wavelength (frequency) Z(in) = Z(0) x tan(beta x l) Open For the case of an open load (i.e. ), the input impedance is once again imaginary and periodic Z(in) = Z(0) x cot(beta x l) Where beta refers to wave number and 'l' refers to length. Using given values, we get 36 = Z(0) x tan(beta x l) ----- (1) 64 = Z(0) x cot(beta x l) ----- (2) Multiplying (1) and (2) we get, 36 x 64 = Z(0) x Z(0) ==> Z(0) = 48 ohms