Geometry is a branch of mathematics that deals with the questions of shape, size, the relative position of figures, and the properties of these figures. Geometry has applications in other branches of mathematics also such as in trigonometry. As we know, trigonometry deals primarily with the sides and angles of a right triangle. And the right triangle is one of the types of triangles in geometry. While geometry has emerged significantly throughout the years, some general concepts are fundamental to geometry. These combine the concepts of the plane, point, line, curve, distance, angle, and angle, as well as the broader advanced insights of topology and manifold.

Triangle is one of the most important geometrical shapes in mathematics. We can observe various types of questions on triangles in geometry. For example finding the missing sides, missing angles, and other parameters. All these problems can be solved by using some specified methods. Out of which, **trigonometric functions** are used to find the missing sides and angles of triangles. These trigonometry formulas can be used in many many when working with geometry.

Applications of trigonometry include various fields such as navigation, astronomy, surveying, periodic functions in calculus, music theory, architecture, and so on. In all these fields, trigonometry is used to solve problems which may directly be related to geometry or indirectly. All the situations wherever we apply trigonometry formulas, the given objects are considered to form a triangle by treating the objects as vertices. Then, we will apply trigonometry to determine the required parameters. Thus, there is also geometry involved in forming triangles and their angles.

Trigonometry has also been noted for its several identities, that is, equations that are true for all possible inputs. Identities comprising only angles are acknowledged as trigonometric identities. Other relations, identified as triangle identities that relate both the sides and angles of a given triangle. When we deal with triangles of any types, the **law of cosines** plays a crucial role in finding the missing parameters and angles. Using this relation of cosines with respect to sides and angles of triangles, we can construct triangles by finding the required parameters along with the given ones. This law generalizes the Pythagoras theorem that holds true for right-angle triangles.

One of the most important applications of trigonometry in architecture. Here, heights, distance and angles of elevation, angles of depression objects are the essential terms involved. All these parameters can be linked with the help of trigonometry and its formulas, ratios and identities. However, trigonometry without geometry shapes is not possible. Thus, both are interlinked in many situations. This we can observe in our daily existence too. For example, a person is standing on the top of a building and observes a certain object on the road which is a certain distance away from the bottom of the building. In this scenario, height of the building can be taken as perpendicular, distance from the object to the bottom of the building as the base and the distance between the object from the top of the building as the hypotenuse. If any two parameters are known for this triangle, we can find the others using trigonometry.