Calculate the length of the rhombus's diagonals if its side is long 5 and one of its internal angles is 80°.

Correct answer:

u1 =  6.43
u2 =  7.66

Step-by-step explanation:

u12=a2+a22aacos80 u12=2a22a2cos80 u1=a2(1cos80)=6.43
 β=18080=100 u22=a2+a22aacos100 u22=2a22a2cos100 u2=a2(1cos100)=7.66

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