Hi, the reference is in the topic/header : Big Book Test 2 Section 5 Question 6. Let me know what other details to add. Thanks!

Hi, Iâ€™m looking for an explanation on what you tried (i.e, your attempt).

I didnâ€™t get too far with this but here is what I think:

If we draw a line from O to Y that will be the radius (also the hypotenuse)

Angle Y is opposite 5.8 and Angle Q is opposite 5.9 therefore Angle Y will be less than Angle Q. Both triangles share the 90 degree angle, if Angle Y < angle Q, then angle O for the bottom triangle will be greater than Angle O for the top triangle, therefore making the half of XY bigger than half of PQ

That works, though you can also deduce this by â€śslidingâ€ť XY/PQ and showing that as the distance from O to the line increases, the length of the chord decreases.