A regular 15-sided polygon is inscribed in a circle with radius 6. Which of the following is the length of one of its sides?

W) 6 sine 24\({}^{\circ}\)

X) 6 cosine 24\({}^{\circ}\)

Y) 12 sine 12\({}^{\circ}\)

Z) 12 cosine 12\({}^{\circ}\)
Y) 12 SINE 12\({}^{\circ}\)