In a triangle XYZ, if < ZYZ is 60, XY = 3cm and YZ =...

Mathematics JAMB 1997

In a triangle XYZ, if < ZYZ is 60, XY = 3cm and YZ = 4cm, calculate the length of the sides XZ.

  • √23cm
  • √13cm checkmark
  • 2√5cm
  • 2√3cm

The correct answer is: B

Explanation

(XZ)2 = 32 + 42 - 2 x 3 x 4 cos60o

= 25 - 24\(\frac{1}{2}\)

XZ = √13cm
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