Найти площадь круга вписанного в квадрат со стороной 12 см

т к сторона квадрата равна 12, то радиус равен 6(проведем отрезок через центр окружности начиная от того как окружность касалась сторон квадрата).

sокружности=пи*r^2=3.14*36=113.04см

s=пr^2

диаметр равен 12 см, следовательно, радиус равен 6 сантиметров.

 

 

 

 

 

  s=3,14*6^2≈ 113.10 см^2

ответ:   ≈ 113.10

 

 

 

 

 

 

 

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Периметр параллелограмма:                               p = 2(a + b), где а и b - стороны параллелограмма. так как b = a + 5, то:                           p = 2(a + a + 5)                        66 = 4a + 10                          a = 56: 4                   a = 14 (см)       b = a + 5 = 14 + 5 = 19 (см) ответ: 14 см; 19 см.