Question

ПОМОГИТЕ ПОЖАЛУЙСТА СРОЧНО СРОЧНО СРОЧНОООО​

Answer 1

3) AB + BC + CD = 20

AB = AC - BC

CD = BD - BC

AD = AC - BC + BC + BD - BC = AC + BD - BC = 12 + 11 - BC = 20

BC = 3

4) AC = AB + BC

17 = AB + 2

AB = 15

BD = CD + BC

8 = CD + 2

CD = 6

AD = AB + BC +CD = 15 + 2 + 6 = 23