в чем состоялись особенности присоединения дальневосточных стран?

длина одной стороны прямоугольника21см,адругой на12см меньше.найдите периметр прямоугольника

две причины почему вода северном ледовитом океане менее солёная,чем в других водах океана

Перевести.One day Mike and his Father want to go the park.Mike,says Father.Let*s go for a walk.It is great! Mike is happy.He likes to go to the park with his Father .I*d like to go the park with great pleasure.says Mike.He can skate,play snowballs in the park.Father likes to play hockey or ski.They have a lot of fun there.Mike and his Father are in the park.Suddenly they see a big dog.The dog sees the boy and begins to bark.Mike is afraid of the dog.He wants to go home.His Father says -Don*t be afraid,Mike.You know the proverb-A barking dog does not bite.Oh yes,says Mike.I know the proverb you know the proverb .But does the dog know the proverb

треугольник АВС. ВD -биссектриса уггла B,угол А= 90 градусов,угол BDC =135 ,AD=5,DC=7. Найти площадь ABC