<prompt> Katika pembetatu ya kulia ABC, imeonyeshwa hapa chini, cosCfrac9sqrt130130. Pata AC.asychora0,0--7,0--0,9--mzunguko,mweusiupana wa mstari1;choraalama ya kulia7,0,0,0,0,9,20,nyeusiupana wa mstari1;leboA,0,0,W;leboB,7,0,E;leboC,0,9,W;lebosqrt130,7,0--0,9,NE;asy  <response>: Kwa kuwa cosCfrac9sqrt130130 na cosCfracACBC, tuna fracACBC fracACsqrt130frac9sqrt130130. Hii ina maana kwamba ACfrac9sqrt130130cdotsqrt130frac9cdotsqrt130cdotsqrt130130 9. 