L=пи*r*n/180
L=пи*4*120/180=8пи/3 cм
S=(1/2)*L*r
S=(1/2)*(8пи/3)*к
S=16пи/3
Ответ: L=8пи/3 ; S=16пи/3
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L=пи*r*n/180
L=пи*4*120/180=8пи/3 cм
S=(1/2)*L*r
S=(1/2)*(8пи/3)*к
S=16пи/3
Ответ: L=8пи/3 ; S=16пи/3