<prompt> Ikiwa angle ABC ni pembe iliyonyooka, toa idadi ya digrii katika kipimo cha angle ABD. asy jozi A,B,C,D; A dir180; D dir60; C dir0;kuchoraB--1.2A,EndArrow; kuchoraB--1.2D,EndArrow; leboA,A,S; nukta A;leboB,B,S; kuchoraB--1.2C,EndArrow; leboC,C,S; leboD,D,dir135;lebo6xcirc,B,NW; lebo3xcirc,B.1,NE; nukta D; nukta C;asy  <response>: Kwa kuwa angle ABC ni pembe iliyonyooka, tuna 6x 3x 180circ, hivyo 9x 180circ na x 20circ. Kwa hiyo, angle ABD 6x 120circ. 