Answer:
∠STU = 40°
Step-by-step explanation:
Using the properties of the rhombus
• The diagonals bisect the angles
• Consecutive angles are supplementary
Sinc the diagonals bisect the angles then
∠UST = ∠USR = 70°, hence
∠RST = 70 ° + 70° = 140°
Hence ∠STU = 180° - 140° = 40° ( consecutive angles are supplementary )
