5cm
4cm
3√3 cm
10√33cm
Correct answer is D
Let each of the unknown side be x.
102=x2+x2−2(x)(x)cos120
100=2x2−2x2cos120
100=2x2+x2=3x2
x = √1003
= 10√3 x √3√3
x = 10√33cm
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