<prompt> Katika mchoro, PQPR na angle QRP 65circ.asychora0,0--cos13pi36,sin13pi36--2cos13pi36,0--0,0, upana wa mstari1;chora0,0--dhambi13pi18cos5pi36,sin13pi18dhambi5pi36, upana wa mstari1;chora1516dhambi13pi18cos5pi36,1516dhambi13pi18dhambi5pi36--1516 dhambi13pi18cos5pi36116dhambi13pi18dhambi5pi36,1516dhambi13pi18dhambi 5pi36-116dhambi13pi18cos5pi36--dhambi13pi18cos5pi36116dhambi 13pi18 dhambi5pi36, dhambi13pi18dhambi5pi36-116dhambi13pi18cos5pi36, upana wa mstari 1;leboQ, 0,0, SW;leboR, 2cos13pi36,0, SE;leboS, sin13pi18cos5pi36,sin13pi18sin5pi36, NE;leboP, cos13pi36,sin13pi36, N;lebo65circ, 2cos13pi36-0.04,0, NW;leboxcirc, 0.05,0.11, E;asyThamani ya x ni nini?  <response>: Kwa kuwa jumla ya pembe katika pembetatu yoyote ni 180circ, basi tukiangalia pembetatu QSR, tuna pembe SQR 180circ - angle QSR - pembe SRQ 180circ - 90circ - 65circ 25circ Kwa kuwa PQ PR, kisha angle PQR angle PRQ. Hivyo, xcirc 25circ 65 circ au x2565, na hivyo x 40. 