Answer:
x = 51°
Step-by-step explanation:
The angle I shaded in yellow is a flat angle which measures 180°.
Use the 129° to find x.
180° - 129° = 51°
<span>In mathematics, a percentage is a number in the fraction of 100. It is often denoted with the symbol of "%", or simply "pct" or "percent". For example, 35% is equivalent to 0.35 or 35/100. The calculator above can take any two values and calculate the third value.</span>