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Pre-Calculus

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Rational and Irrational Numbers
Rational and Irrational Numbers 150 150 SchoolTutoring Academy

Rational numbers A rational number is any real number that can be written as a ratio, that is, it can be written as a fraction. A rational number can be…

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Imaginary Numbers: Understanding the Imaginary Part
Imaginary Numbers: Understanding the Imaginary Part 150 150 SchoolTutoring Academy

We are told that we cannot take square root of a negative number. However, we can take the square root of a negative number, but it involves using a new…

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Unit Circle and Trigonometric Ratios
Unit Circle and Trigonometric Ratios 150 150 SchoolTutoring Academy

The unit circle is a circle whose radius is one and center is at the origin.                     According to Pythagorean Theorem,…

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Converting between Radians and Degrees
Converting between Radians and Degrees 150 150 SchoolTutoring Academy

Radian and Degree are the most commonly used units to measure angels. Angle in degrees is denoted by symbol °  e.g. 50°. The radian is represented by ‘rad’ or by…

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Six Trigonometric Ratios
Six Trigonometric Ratios 150 150 SchoolTutoring Academy

In greek ‘Trig’ means triangle and ‘metic’ is for measurement. The Trigonometric rations are used to express relationship between angles and sides of a right triangle ( a triangle with…

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