Math Is Fun Forum

Douglasm

Member

Registered: 2009-12-25

Posts: 15

Geometry - Circles/Polygons

The chords AB and CD don't cut each other inside a circle of radius R.

and

The lines AC and CD make an angle of:

a) 36º

b) 21º or 51º

c) 57º or 87º

d) The problem is indefinite

e) None of the previous answers

C is the correct answer.

PS: I can see that AB equals the side of a star pentagon and CD equals the side of a convex decagon. Anyhow, I couldn't get the problem solved. I appreciate any assistance.

Last edited by Douglasm (2010-02-17 05:52:03)