Can you help me with this is difficult to me to understand thanks

Circles Formula Sheet Arc Length: 7 = = 360 *. 2nr or / = = -. nd Sector Area: S = X - . 1)- 2 360 360 Equation of a circle with center (h, k) and radius r: (x - h)~ + (y - k)? = 12 my1 = 1(mAD + mBC) B mz1 = +(mAB) (Average of intercepted arcs) D B E mcA = 1(mDE - mBC) mzA = 1(mDC - mBC) mcA = +(mBDC - mBC) + (Big Arc - Small Arc) + (Big Arc - Small Arc) + (Big Arc - Small Arc) AE . EC = BE . ED AC . AB = AE . AD (AD) = AC . AB (Whole . Outside Part) = (Whole . Outside Part)