🧪 Arccos is useful for estimating the optimal bond angles of polyatomic molecules, like e.g.💧 Calculating the hydraulic radius of a partially filled pipe is possible if you know wetted perimeter, calculated from a formula using arccos. And there you are, an inverse cosine application. 🥢 Finding the angle between two vectors / lines / line segments – rearrange the dot product formula so that angle is the subject of equation. ⛓Calculating the shape of a hanging chain: arccos describes the catenary curve: meet this wonderful mathematical creature at Omni's catenary curve calculator.
If you know the three sides of a triangle, and you'd like to find any of the triangle's angles, you'll need to use arccos: find everything about this law at our law of cosines calculator. 📐 Solving the triangle, using the law of cosines.
You may think that arccos is another useless term from trigonometry, but we want to convince you this is not the case! The inverse cosine function is really helpful for many scientific and real-life problems (awesome, isn't it?):
