19 * 30 = 19 * (3 * 10) = (19 * 3) * 10 = 57 * 10 = 570
15 * 14 = 15 * (2 * 7) = (15 * 2) * 7 = 30 * 7 = 210
15 * 16 = 15 * (4 * 4) = (15 * 4 ) * 4 = 60 * 4 = 240
27 * 40 = 27 * (4 * 10) = (27 * 4) * 10 = 108 * 10 = 1080
18 * 500 = 18 * (5 * 100) = (18 * 5) * 100 = 90 * 100 = 9000
9 * 4000 = 9 * (4 * 1000) = (9 * 4) * 1000 = 36 * 1000 = 36000
S=S1+S2
S1=90*70=6300м²
S2=(110-70)*(90-80)=40*10=400м²
S=6300+400=6700м²
L-длина окружности=2пи(3.14)*r
2*3.14*1=6.28
Тому и равна. 1м/с
...........