# Triangle trigonometry

The topic is divided into the following subtopics:
• Triangles
• Polygons
• Circles

### Triangles

Part I:
• Computation of angle measures in a triangle where the angles satisfy the given condition
• Relationships between sides and angles of a triangle
• Properties of triangles, computational problems
Part II:
• Trigonometric functions in a right triangle
• Application problems solved using trigonometric functions
• Law of sines and law of cosines
Part III:
• More complex application problems

### Polygons

Part I:
Computational problems on angles, lengths and areas
• Square
• Rectangle
• Rhombus
Part II:
Computational problems on angles, lengths and areas
• Trapezoid
• Parallelogram
• Regular polygons
Part III:
Computational problems on angles, lengths and areas
• Deltoid (Kite)
• Complex computational problems on angles, lengths and areas

### Circles

Part I:
• Inscribed and central angle
Part II:
• Angles between tangents
• Polygons inscribed to a circle
• Disc, annulus
• Circular sector and circular segment
Part III:
• Disc, circular sector and circular segment – complex problems