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# Intro to Pythagorean trigonometric identities

Let's get introduced to trigonometric identities by learning the Pythagorean identities. This is our first step towards using trigonometric identities to move from one ratio to another. Created by Aanand Srinivas.

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• how to solve this Question :-

Question :-
"A circle is Drawn with a centre 'O' . 'OB' and 'PQ' are the radius of the cicle with the length of 5cm . A point 'A' is on and between (not in the mid) of the line 'PO' . A point 'C' is placed outside the circle . From point C two lines are extended in such a way that those line are joint with 'A' and 'B' respectively and form a Quadrilateral 'OACB' . 'Angle POB = 72 degree' Find angle ACB ?"

I tried it for more then 30 times but i was unable to solve it , please help me to come out from this Question .