tg∠ACB=AB/BC6/2=3;
∠ACB=71.6°;
∠ECD=180°-(∠ACB+ACE)=180°-(71.6°+90°)=18.4°;
tg∠ECD=ED/CD;
tg(18.4°)=0.48;
ED=CD*tg(18.4°)=2.5*0.48=1.2 см.
Объяснение:
tg∠ACB=AB/BC6/2=3;
∠ACB=71.6°;
∠ECD=180°-(∠ACB+ACE)=180°-(71.6°+90°)=18.4°;
tg∠ECD=ED/CD;
tg(18.4°)=0.48;
ED=CD*tg(18.4°)=2.5*0.48=1.2 см.
Объяснение: