Question

如图,己知AD=2cm,AB=3cm,AC=4cm,BC=6㎝,角B=36度,角D=110度,角ACD=34度求

Answer 1

1）∠CAD=180°-∠ADC-∠ACD=36°

CD/sin∠CAD=AD/sin∠ACD

CD=2*sin36°/sin34°≈2.1023

2) AC/sin∠B=BC/sin∠BAC

sin∠BAC=6*sin36°/4≈0.8817

∠BAC≈61.85°

∠BAD=∠BAC+∠CAD=97.85°