Answer :
a) 40
becuase you know one angle 50 and the intersection means 90. A triangle is 180, and 50+90=140. To get 180 the last angke would have to be 40.
becuase you know one angle 50 and the intersection means 90. A triangle is 180, and 50+90=140. To get 180 the last angke would have to be 40.