1. Determine if each of the following triangles is a right-angled triangle. For each right-angled triangle, state the right angl
e. (Check attached picture) The answers are: (a) Yes; <B (b) No (c) No (d) Yes; <O
I want to know how these answers came, like how can we determine if the triangle is a right-angled triangle or not and which angle is the right angle from the statements in the question.
You can use trigonometry specially the cos rule in this case. I can’t send the other pictures. But using the cos rule you can check whether the angle is 90