1) L = 2πR = 2 *3,14 *14 = 87,92
2) D = L : π = 18,84 : 3,14 = 6
3) S= πR² = 3,14 * 4² = 50,24
4) R² = S : 3,14 = 9 ; R = 3; D = 3*2 = 6
5) L= πD; D = L : π = 24 : 3 = 8 ; R= 8:2 = 4 S = πR² = 3*4² = 48
6) 11-2х = (15 + х)*0,05
11- 2х = 0,75 + 0,05х
-2х - 0,05х = 0,75 - 11
- 2,05х = - 10,25
х = 5