Question

please help needed urgently

Answer 1

The above picture may be helpful.

Answer 2

Hi ,

Here I am using A instead of alfa,

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We know that ,

1 ) Distance from a point ( x , y ) to the

origin ( 0 , 0 ) = √ x² + y²

2 ) cos² A + sin² A = 1

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Now ,

Distance from the point

( x , y ) = ( a cosA , a sinA ) to the

origin ( 0 , 0 )

= √ ( a cosA )² + ( a sinA )²

= √ a² cos² A + a² sin² A

=√ a² ( cos² A + sin² A )

= √a²

= a

I hope this helps you.

:)