ГДЗ по математике 6 класс Дорофеев Задание 985

\[\boxed{\mathbf{985\ (985).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]

\[\textbf{а)}\ AB = CD = 5 - ( - 2) = 5 + 2 = 7.\]

\[AD = BC = 3 - ( - 2) = 3 + 2 = 5.\]

\[P = 2 \bullet (AB + BC) = 2 \bullet (5 + 7) = 2 \bullet 12 = 24.\]

\[S = AB \bullet BC = 5 \bullet 7 = 35.\]

\[\textbf{б)}\ D( - 8;\ - 2).\]

\[AB = CD = 1 - ( - 8) = 1 + 8 = 9.\]

\[BC = AD = 3 - ( - 2) = 3 + 2 = 5.\]

\[P = 2 \bullet (AB + BC) = 2 \bullet (9 + 5) = 2 \bullet 14 = 28.\]

\[S = AB \bullet BC = 9 \bullet 5 = 45.\]