In paralelogramul ABCD m(unghiului CDB) =50grade m(unghiului DCB)=70 grade . Calculați măsurile unghiurilor
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<)DCB =DAB =70 grade (ABCD = paralelogram)
DC// AB , DB secanta => <)CDB =ABD =50 grade,(alterne int.)
<) DBC = 180-(DCB+CDB ) =180-(70+50 ) =60 gr.
<) ADB =DBC =60 gr ( alterne int. )
=> ADC =ABC =50+60 =110 gr
DC// AB , DB secanta => <)CDB =ABD =50 grade,(alterne int.)
<) DBC = 180-(DCB+CDB ) =180-(70+50 ) =60 gr.
<) ADB =DBC =60 gr ( alterne int. )
=> ADC =ABC =50+60 =110 gr
ordodimaria:
ok
<)DCB =DAB =70 grade (ABCD = paralelogram)
DC// AB , DB secanta => <)CDB =ABD =50 grade,(alterne int.)
<) DBC = 180-(DCB+CDB ) =180-(70+50 ) =60 gr.
<) ADB =DBC =60 gr ( alterne int. )
=> ADC =ABC =50+60 =110 gr
DC// AB , DB secanta => <)CDB =ABD =50 grade,(alterne int.)
<) DBC = 180-(DCB+CDB ) =180-(70+50 ) =60 gr.
<) ADB =DBC =60 gr ( alterne int. )
=> ADC =ABC =50+60 =110 gr
ok
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