+4116 I just don't get anything.. but when CPhill explains it then it's like BOOM duh I shoulv'e know this or that.. heh
+4116 Oh she's on here too sometimes, her and CPhill are really smart, I think they're friends yea.
+129847 This one is a little difficult.....
Since NA = PA....then chords RO and MO are equidistant from the center of the circle, A...and chords that are equidistant from the center of a circle are equal.....thus RO = MO = 7
Further....a segment drawn from the center of a circle that is perpendicular to a chord, bisects that chord
So since AP is perpendicular to RO and AN is perpendicular to MO.....then
RP = PO = 1/2 RO and MN = NO = 1/2 MO
But PO = 1/2 RO and since RO = MO then PO = (1/2) MO
Then PO = (1/2) * 7 = 3.5
