When I do what the problem statement says, I get 47° for the left angle and 58° for the right one. They are not congruent.
<em><u>Planning is the process of thinking about the activities required to achieve a desired goal.</u></em>
(40+x)/2=60
40 +x = 120
x = 80
check :
40+80 = 120
120/2 = 60
so his second round needs to be 80 mph
9 because most of the triangle have to sides of the same sizes