100-30=70-50=20
there's your equation
Okay we know that tangent-chords creat 90 degree angles so what we have is a right triangle with a base of 9 and a height of 12, so do Pythoagoreas Theorem and we have 81+144=225 square root of 225 is 15 and that is AJ
1 feet is 12 inches and there is 6 segments in one feet then in 12 feet there is 72 segments
