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INTRODUCTION OF BASIC ALGEBRA
BASIC ALGEBRA What is Algebra? Algebra is the branch of mathematics that uses letters in place of some unknown numbers. You've been using algebra since your early schooling, when you learned formulas like the area of a rectangle , with width w , height h : A = w × h We used letters to stand for numbers. Once we knew the width and height, we could substitute them into the formula and find our area. Another one you may have seen is the area of a circle , with radius r : A = π r 2 As soon as we know the length of the sides, we can find the area. Literal numbers (the letters used in algebra) can either stand for variables (the value of the letter can change, like the w , h and r in the examples of the area of a rectangle and the area of a circle) or constants (where the value does not change), fo...
INTRODUCTION OF TRIGNOMETRY
Trigonometry (from Greek trigōnon , "triangle" and metron , "measure" [1] ) is a branch of mathematics that studies relationships between side lengths and angles of triangles . The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies . The Greeks focused on the calculation of chords , while mathematicians in India created the earliest-known tables of values for trigonometric ratios (also called trigonometric functions ) such as sine . [3] Throughout history, trigonometry has been applied in areas such as geodesy , surveying , celestial mechanics , and navigation . [4] Trigonometry is known for its many identities , [5] [6] which are equations used for rewriting trigonometrical expressions to solve equations, to find a more useful expression, or to discover new re...
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