Question

Think about each of the following. Which of these three triangles is impossible to draw?

Answer 1

Check by using sum of angles of triangle = 180°

1. 20+45 < 180 so third angle will make it 180 which means it's possible to draw
2. 120+50 = 170< 180 so third angle being 10 will complete the triangle
3. 90+100 = 190 > 180 so third angle being (-10) is impossible for the triangle so it can't be possible