In quadrilateral abcd ad=bc, m∠dac=50°, m∠dca=65°, m∠acb=70°. find m∠abc.

m<ABC= 55 degrees

Step-by-step explanation:

m<CAD+m<ACD+m<ADC=180 degrees              Sum of <'s in triangle

50+65+m<CDA=180 degrees                               substitution

m<CDA=65                                                             Algebra

AC=AD=BC                                                             Def of Isos triangle

m<ACB+m< ABC+m<BAC=180 degrees              Sum of <'s in triangle

m<ABC=m<CAB                                                     Def of Isos triangle

70+2m<ABC=180                                                    Substitution    

m<ABC=55                                                              Algebra        

98 points djdjsi zisksis sjsjsi sisksj sksjdj sksks sjsisj

answer: input the dimensions of the room to be painted. click the button to calculate the amount of paint and man-hours needed for this job.

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step-by-step explanation: