1. ## missing angle

Find the missing angle.
Triangle has 2 angles. One 45 degrees and the other of 106 degrees. My choices are
A) 84degrees B) 86 degrees C) 29° D) 82 degrees

2. It a geometrical rule that the three angles in any triangle will have a sum of 180 degrees. In equation form:

$\theta_1+\theta_2+\theta_3=180
$

Since you already know two of the angles, finding the third is simply algebra.