Math Is Fun Forum

headstillhurts

Guest

Unit circle / Geometry

I know the basics of unit circle but I'm not even remotely aware about where to start with this problem. Any help pointing me in the right direction would be great. Cheers

Bob

Administrator

Registered: 2010-06-20

Posts: 10,626

Re: Unit circle / Geometry

hi headstillhurts

Welcome to the forum. 

When AD is a diameter, the angle ABD will always be 90 (or pi/2) so that should get you started.

Bob

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You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

Nehushtan

Member

Registered: 2013-03-09

Posts: 957

Re: Unit circle / Geometry

It’s a unit circle so its radius is 1.

Last edited by Nehushtan (2014-07-25 23:44:19)

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headhurts

Member

Registered: 2014-05-04

Posts: 8

Re: Unit circle / Geometry

hi headstillhurts

Welcome to the forum. 

When AD is a diameter, the angle ABD will always be 90 (or pi/2) so that should get you started.

Bob

Thanks Bob. It took me some time to figure out what the question was even asking. But together with your answer, the whole thing finally clicked.

PS Had problems logging in with my normal account for some reason. So just used a temp account to put that question up earlier.