1. Найдите длину окружности и площадь круга, если радиус равен:
а) 12см,
б) 0,2см,
в) 2/3cм
Answers & Comments
MM18
S = piR^2 L = 2piR a) L = 2pi * 12 = 24pi S = pi12^2 = 144pi б) L = 2pi * 0.2 = 0.4pi S = pi0.2^2 = 0.04pi в) L = 2pi * 2/3 = 4pi/3 S = pi *(2/3)^2 = 4pi/9
Answers & Comments
L = 2piR
a) L = 2pi * 12 = 24pi
S = pi12^2 = 144pi
б) L = 2pi * 0.2 = 0.4pi
S = pi0.2^2 = 0.04pi
в) L = 2pi * 2/3 = 4pi/3
S = pi *(2/3)^2 = 4pi/9