Angle 1 = 30° Angle 2 = 90° ⇒ Angle 3 = 60° So, it's right triangle. We can set the length of one side and get all other sides. So, we have 1 triangle. If there are 2 or more triangles with the same data, all the triangles will be congruent because of : <span>Two triangles are </span><span>congruent if </span>"<span>ASA: Two interior angles and the included side in a triangle have the same measure and length, respectively, as those in the other triangle</span><span>.</span>"
