trigonometry
n. uncountablen. the branch of math that studies the relationships between the sides and angles of triangles. You use it to solve problems involving height, distance, and angles.
n. the branch of mathematics dealing with the relations of the sides and angles of triangles and with the trigonometric functions. Often used in fields such as engineering, physics, and navigation.
I am studying trigonometry to help with my physics homework.
The architect used basic trigonometry to calculate the exact angle of the roof's slope.
Advanced trigonometry allows for the precise modeling of periodic phenomena, such as sound waves and the oscillation of mechanical systems, through the use of sine and cosine functions.
PIE word *tréyes From 1610s, from New Latin trigōnometria, from Ancient Greek τρίγωνον (trígōnon, “triangle”) + μέτρον (métron, “measure”), equivalent to trigono- + -metry.