Медиана к гипотенузе равна половине гипотенузы
(это радиус описанной окружности)))
угол ОСА=60 градусов
угол РСА=45 градусов
This autumn my mother, sister and me traveled to Spain. It took us much time to get to Spain, but it was worth it. I was very surprised to find out that the weather in Spain is hot, because in Russia it was too cold. Many people in Spain do not speak Russian, many people wear very simple clothes, and it was difficult to get used to.
There we met many children. We did not notice that they did not understand us. We were friends and played together. My family and I often walked along the streets. It was wonderful. Streets in Spain are very clean. We also visited a large aquarium. There we saw different fishes, sharks, and rays. We spent two weeks in Spain.
When we came back to Russia it was already snowing here. I enjoyed the trip.
Угол 2 = 40
угол 3 = 140
угол 1 = 140
1. AOD=180
COD=180-53-91=36
2. 1+b+4=180
4=a=30
1=180-b-4=180-140-30=10
1=3=10
2=b=140
3. ABD=DBC
Одна общая сторона, две стороны равны пот условию и угол между однотипными сторонами равен значит треугольники равны
4. высота дает прямой угол
ABD=BDC
по общей стороне по равным сторонам по условию и углу 90 между ними - значит AB=BC треугольник равнобеденный
5. ABC=ACD
по общей сторон АС и двум прилежащим к ней углам
значит AB=BC
6. 1+2=180
x+3x=180
4x=180
x=45
1=45
2=135
7/ Нет не существует. Одним из условий треугольника сумма двух сторон больше третьей
1+2<4
8/ A=90-B=90-40=50
ACD=90-A=90-50=40
