Задача 1164. Чему равна градусная мера AOB (рис. 8)?

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As we know the weather depends on the season and the climate of the country.

When winter comes, the weather is cold, windy and snowy. Lakes and rivers are frozen and the roads are covered with ice. In spring nature awakens from her long winter sleep. The trees are filled with new life, the earth is warmed by the rays of the sun, and the weather gets milder. The sky is blue and cloudless. Summer is the hottest season in the year. It is warm and sunny but rainy sometimes. In autumn the sky is often cloudy. Also the weather is  rainy and the sun shine very seldom. Summer is the hottest season in the year. It is warm and sunny but rainy sometimes.

It was three years ago. Then it was winter and I was in grade 5. My friend and I played snowballs in the school yard. We had fun. Nothing foreshadowed troubles. They threw themselves into each other's snowballs and decided to go home. But someone threw a snowball at me. I turned around and saw a classmate and whose boy I did not know. They started teasing us, and we started throwing them with snowballs. It was very funny! Soon we were tired and we said good-bye and went home. This day I will never forget.