COMPLEX NUMBERS

The number in the form of a + ib where a and b are real numbers and i = √-1 is called the complex number

The square root of negative number (√-a) is called the imaginary number, for example √-1, √-5, √-16 etc all are imaginary numbers.

DISTANCE BETWEEN TWO POINTS

Consider the figure below:

Let P and Q be points with coordinates (x₁,y₁) and (x₂,y₂) respectively as shown above.

PQR is right angled triangle. By Pythagoras theorem:

PQ² = PR² + RQ² = (x₂-x₁)² + (y₂ – y₁)²

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LINEAR INTERPOLATION

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