Вычислите длину дуги окружности с радиусом 4 см,если ее градусная мера равна 120 градусам.чему равна площадь соответствующего данной дуге сектора?

длина круга равна 2*пи* r=2*4*пи=8*3,14=25,12см;   далее 120°=1/3(360°) длина дуги 1/3 от длины круга=25,12: 3=8,37см площадь круга = пи*r^2=3,14*16=50,24 площадь сектора равна 50,24: 3=16,75 см2

ответ:

how can i help

you?

brian: i'd like to know if you have a room

available for the

week of the fifteenth.

front desk: just a second

, sir. let me check reservations.

yes, we do.

brian: oh, brilliant

. how much is the daily rate for a couple?

front desk: that would be $95, with all

included,

sir.

brian: ok. i'd like to book a room for three days

then, from

the fifteenth to the seventeenth.

front desk: yes, sir. are you coming to chicago for the orthopedic

convention?

brian: no. our daughter lives there. we're coming to visit her.

front desk: great

sir. let me fill the reservation

form. what your and their names,

sir?

brian: taylor. brian taylor.