Caranya gimana ini??? Yang tau plis jawab

1. 90/360 x 2x22/7 x 7 = 1/4 x 44 = 11
2. 60/360 x 2x22/7 x 21 = 1/6 x 44x3 = 1/2 x 44 = 22
3. 120/360 x 2 x 22/7 x r = 88
     1/3 x 44/7 x r = 88 maka 44/21 r = 88 ,,r=88 x21/44 = 42
4. derajat / 360 x 2 x 3,14 x 100 = 31,4 
    derajat = (31,4 x 360)/(2 x 3,14 x 100) = 360/20 = 18
5. 72/360 x 2 x 3,14 x r = 1256
     r = 1256 x 360 / ( 72 x 2 x 3,14 ) = 1000