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Einstein's work in theoretical physics had many practical applications, some of which affect your daily life. The best example is the laser. Although Einstein did not invent the laser, he did produce the theoretical work which made possible the invention of the laser, and of course, lasers are now very much part of the lives of almost everyone, since they play a crucial role in computer-based manufacturing processes, in DVD or CD devices, in laser eye surgery, in fiber optic cables, etc.
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It depends on what angle. The main angles of a rectangle are all 90 degrees and knowing that does not help. If however, the angle in question is the angle made by the diagonal with one of the sides, then it is possible to use a basic trigonometric ratio to work out the length. Details will depend on which angle is given.
Long ago, but the invention of Zero about 200 bc is considered a crowning and vital moment. Our common number system is based on this and the further work of the Arabs.
Whitfield Diffie is one of the creators of public key cryptography in the 1970's. Martin Hellman and Ralph Merkle were the others. Together they created the company RSA to bring encryption products to the marketplace.