a) Có : \(\widehat{BON}=\widehat{BOM}+\widehat{MON}=90^0+\widehat{MON}\)
Và : \(\widehat{AOM}=\widehat{AON}+\widehat{MON}=90^0+\widehat{MON}\)
=> \(\widehat{BOM}=\widehat{AON}\)
b) Có : \(\widehat{BON}+\widehat{AOM}=\widehat{BOM}+2\widehat{MON}+\widehat{AON}=180^0\)
Mặt khác : \(\widehat{BOM}+\widehat{MON}+\widehat{AON}=150^0\)
=> \(\widehat{MON}=180^0-150^0=30^0\)
hình ảnh chỉ mang tính chất minh họa thôi nha
a) ta có:
góc AON = góc AOB - góc BON
= 1500-900=600
góc BOM = góc AOB - góc AOM
= 1500-900=600
=> góc AON = góc BOM (=600)
b)ta cũng có:
góc BOM + góc MON + góc NOA = 1500
=600+ góc MON +600=1500
=> góc MON = 1500-(600+600)
= 300
vậy góc MON = 300