Set up an equation equal to <span>180o</span>
<span>3x+3x+6x=180</span>
<span>12x=180</span>
<span>x=<span>18012</span>=15</span>
So, the measure of the angles are:
<span>3x=3×15=45</span><span>3x=3×15=45</span><span>6x=6×15=<span>90</span></span>
13.3x + 8.1 = 74.6
C. 5
