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PROPERTIES OF TRIANGLES

Pythagorus Theorem

a^2 + b^2 = c^2

Where:
c is the hypotenuse of a right angle triangle and a and b are two sides containg the right angle.

Cosine Law

c^2 = a^2 + b^2 - 2ab (Cos C)

This formula is applicable to any tirangle. Here a, b and c are the three sides of the triangle and A, B and C are the angle opposite to these sides respectively

similarly

a^2 = b^2 + c^2 - 2bc (Cos A)

and

b^2 = c^2 + a^2 - 2ca (Cos B)

Note: This is a general law and if you make any of the angles equal to 90 degrees it gives the Pythagorus Theorom as Cos of 90 degrees = 0

Sine Law

(Sin A)/a = (Sin B)/b = (Sin C)/c

This formula is applicable to any tirangle. Here a, b and c are the three sides of the triangle and A, B and C are the angle opposite to these sides respectively