Question

The vertex of the angle may be on the circle, inside the circle, or outside the circle. Each type of angle has a formula for computing the measure of the intercepted arc. Think of a poem, a jingle, a song, or some other way to remember the three formulas.

Answer 1

This will help you remember, but it's not a poem, :(
For chords that meet internally, ADD & divide by 2
For chord that meet externally, SUBTRACT & divide by 2
For chord that meet at the circumference, well, neither add nor subtract, just divide by 2.

It's like your wallet, when money comes IN, you add,
when money goes OUT, you subtract!