Find the value of (theta) in the diagram

Correct Answer: Option C

Explanation

Using cosine formula (t(sqrt{3}))² = t² + t² – 2t² cos(theta)
3t² = 2t² – 2t² cos(theta) = 2t²(1 – cos(theta))
1 – cos(theta) = (frac{3t^2}{2t^2}) = (frac{3}{2})
cos = 1 – (frac{3}{2} = -frac{1}{2})
(theta) = cos^-1(-(frac{1}{2})) = 120^o and 240^o
N.B 0 (geq) (theta) 360