1.
Чтобы перевести градусную меру угла в радианную, нужно умножить её на π и разделить на 180.
1) 60° = 60 * π/180 = 60π/180 = 1π/60 рад.
2) 145° = 145 * π/180 = 145π/180 = 29π/36 рад.
3) 240° = 240 * π/180 = 240π/180 = 4π/3 рад.
4) 320° = 320 * π/180 = 320π/180 = 16π/9 рад.
5) 105° = 105 * π/180 = 105π/180 = 7π/12 рад.
6) 40° = 40 * π/180 = 40π/180 = 2π/9 рад.
7) 130° = 130 * π/180 = 130π/180 = 13π/18 рад.
8) 140° = 140 * π/180 = 140π/180 = 7π/9 рад.
9) 340° = 340 * π/180 = 340π/180 = 17π/9 рад.
10) 120° = 120 * π/180 = 120π/180 = 2π/3 рад.
2.
π=180
1) 2*180:5=72°
2) 8*180:3=480°
3) 12*180:5=432
4) -7*180:36=-35°
5) 9*180:4=405°
6) -5*180:6=-150°
351
1)100+150=250(га)
2)100:(250:100)=40(%)
353
1)138-120=18
2)120*(18:100)=15(%)