Question

Помогите решить срочно

Answer 1

5. L = 2πR = 2*0.8π = 1.6π
6 S = πR²=4π = 12.56
7.  S = 1/4πD² = 1/4π*4 = π = 3.14 м²
8. S = πR²    R = √48/π = √16 = 4