Question

∠AOB=∠COD=90°,∠BOC:∠AOD=7:11,求∠AOC的度数

Answer 1

设∠AOC=A 因 ∠AOB=∠COD=90°

则,∠BOC=90-A,∠AOD=90+A

因 ,∠BOC:∠AOD=7:11

(90-A)/(90+A)=7:11

解得A=20°

∠AOC=20°