The Solution.
The triangle that can be used with sine, cosine, and tangent ratios must have the following characteristics:
1. The triangle must be a right-angled triangle.
2. The triangle must have one of its angles as 90 degrees.
3. Another angle must be indicated as the angle of interest.
4. At least two sides and an angle must be identified/represented with values.
5. The ratios under consideration can be used to find all the angles and all the sides.