Verified answer

1. S=π * r^2, где r=d/2.

а) S=22/7*((36/2)^2)=7128/7 (cm^2)

б) S=22/7*((4,6/2)^2)=116.38/7 (m^2)

Verified answer

S=π*d^2/4

1) d=36 см

S=(22/7)*(36^2/4)=(22*36*9)/7=7128/7=1018 2/7 (кв.см)

2) d=4,6 м

S=(22/7)*(4,6^2/4)=(22*4,6*1,15)/7=116,38/7=11638/700=16 219/350 (кв.м)