чему равен угол между пересекающимися ребрами куба?

Ответьте на вопросы по тексту:

Every day, millions of tourists come to
London to see and listen to Big Ben. But,
what exactly is Big Ben?
Most people think that Big Ben is the tall
clock tower that stands above the Houses of
Parliament . Well no! Big Ben is not the
clock. It is one the four huge columns inside
the tower. Its name comes to the bell’s
commissioner of works, Sir Benjamin Hall,
or Ben. The tower is 98 meters high. The bell
inside the tower is 14 kilos. The clock on the
tower is also huge. Each of the four
clockfaces is 7 meters wide. The hour
hands are about 3 meters long and the minute
hands are about 4 meters long.
Perhaps one day you can go to London and
see this amazing tourist attraction.

Big Ben is in.......

Big Ben is the name of......

The tower is..............................

Each hour hand is.........

упростить выражения:косинус(3П\2+альфа)это все деленное на синус(П-альфа)

расскажите,как должен вести себя культурный человек на улице,в других общественных местах.