Answer:
c
Step-by-step explanation:
The diagonals of the rhombus intersect at right angles, thus
∠1 = ∠2 = ∠3 = 90°, hence
∠1 = 15x = 90 ( divide both sides by 15 )
x = 6
∠2 = x + y = 90 ← substitute x = 6
6 + y = 90 ( subtract 6 from both sides )
y = 84
∠3 = 30z = 90 ( divide both sides by 30 )
z = 3
x = 6, y = 84, z = 3 → c
