In a triangle XYZ, if (A. √23cm) (B. √13cm) (C. 2√5cm) (D. 2√3cm)

Correct Answer: Option B

Explanation

(XZ)² = 3² + 4² – 2 x 3 x 4 cos60^o
= 25 – 24(frac{1}{2})
XZ = √13cm