a Examining the diagram, we notice that AB and CD are both the intercepted arc of the same central angle ∠ CPD. This must mean they have the same angle measure, so they are similar.
In order to transform AB onto CD we can use a dilation with a center at P. Check it by moving point A to point C on the diagram below.
b As discussed in Part A, AB and CD are both the intercepted arc of the same central angle. This means they have the same angle measure. However, regarding length, the circle that makes CD has a greater radius than the circle that makes AB. Therefore, it must be that CD>AB.
