Answer:
64
Step-by-step explanation:
Therefore A = (0.4338) = 64.29°
i) Law of cosines: = + – 2bccos(A)
ii) XZ = a = 16 , YZ = b = 12, XY = 17, ∠Y = ∠A
iii) = + - (2 12 17 cos(A))
⇒ 256 = 144 + 289 - 408cos(A)
⇒ 256 - 144 - 289 = -408cos(A)
⇒ -177 = -408cos(A)
⇒ cos A = = 0.4338
D(THE LAST ANSWER CHOICE)