<prompt> Oktagoni ya kawaida ABCDEFGH ina pande za urefu wa mbili. Tafuta eneo la bigtriangleup ADG. Eleza jibu lako kwa njia rahisi kabisa.  <response>: Tengeneza pembetatu ya kulia bigtriangleup AOB kama inavyoonyeshwa kwenye mchoro. Tangu AB2, tuna AOsqrt2 na AD22sqrt2. Vile vile, tuna OG2sqrt2, kwa hivyo anzaaligntextAreabigtriangleup ADGfrac1222sqrt22sqrt21sqrt2 2sqrt243sqrt2.mwishoalign asyukubwa wa kitengo 1.75cm;jozi A,B,C,D,I,F,G,H,K;A0,0;B1,1;K1,0;C2.41,1;D3.41,0;I3.41,-1.41;F2.41,-2.41;G1,-2.41;H0,-1.41;lebo2,1.7,1,N;lebo2,1.7,0,N;lebo2,1,-0.7,E;lebosqrt2,0.5,0,N;lebosqrt2,2.91,0,N;lebosqrt2,1,-1.7,E;kuchoraA--B--C--D--I--F--G--H--mzunguko;kuchoraA--D--G--mzunguko;kuchoraH--I;kuchoraB--G;kuchoraC--F;leboO,K,NE;leboA,A,W;leboB,B,N;leboC,C,N;leboD,D,E;leboE,I,E;leboF,F,S;leboG,G,S;leboH,H,W;asy 