Diagonals in diamond

In the rhombus is given a = 160 cm, alpha = 60 degrees. Calculate the length of the diagonals.

Correct result:

u1 =  160
u2 =  277.13


u12=a2+a22aacos60 u12=2a22a2cos60 u1=a2(1cos60)=160
 β=18060=120 u22=a2+a22aacos120 u22=2a22a2cos120 u2=a2(1cos120)=277.13

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