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3 years ago

I don't understand how to do this so please explain or show me how to get the answer

Mathematics

1 answer:

nekit [7.7K]3 years ago

4 0

Answer:

m<ADB=70°

m<ADC=110°

m<DAC=45°

Step-by-step explanation:

<ADB=<ABD(being isosceles triangle: AD=AB)

<ABD+<ADB+<DAB=180°(sum of the angle of triangle is 180°)

2<ADB+40°=180°(<ADB=<ABD and <DAB=40°)

2<ADB=140°

<ADB=70°

<ADB+<ADC=180°(being straight angle)

70°+<ADC=180°

<ADC=110°

<ADC+<ACD+<DAC=180°( sum of the angle of triangle is 180°)

110°+25°+<DAC=180°

<DAC=45°

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