| radian | 1 rad | 2 rad | 3 rad | 4 rad | 5 rad | 6 rad | 7 rad | 8 rad | 9 rad | 10 rad | 11 rad | 12 rad | 13 rad | 14 rad | 15 rad | 16 rad | 17 rad | 18 rad | 19 rad | 20 rad | 21 rad | 22 rad | 23 rad | 24 rad | 25 rad | 26 rad | 27 rad | 28 rad | 29 rad | 30 rad | 31 rad | 32 rad | 33 rad | 34 rad | 35 rad | 36 rad | 37 rad | 38 rad | 39 rad | 40 rad | 41 rad | 42 rad | 43 rad | 44 rad | 45 rad | 46 rad | 47 rad | 48 rad | 49 rad | 50 rad | 51 rad | 52 rad | 53 rad | 54 rad | 55 rad | 56 rad | 57 rad | 58 rad | 59 rad | 60 rad | 61 rad | 62 rad | 63 rad | 64 rad | 65 rad | 66 rad | 67 rad | 68 rad | 69 rad | 70 rad | 71 rad | 72 rad | 73 rad | 74 rad | 75 rad | 76 rad | 77 rad | 78 rad | 79 rad | 80 rad | 81 rad | 82 rad | 83 rad | 84 rad | 85 rad | 86 rad | 87 rad | 88 rad | 89 rad | 90 rad | 91 rad | 92 rad | 93 rad | 94 rad | 95 rad | 96 rad | 97 rad | 98 rad | 99 rad | 100 rad |
| helf circle | 0.3183099 1/2 circle | 0.6366198 1/2 circle | 0.9549297 1/2 circle | 1.2732396 1/2 circle | 1.5915495 1/2 circle | 1.9098593 1/2 circle | 2.2281692 1/2 circle | 2.5464791 1/2 circle | 2.8647890 1/2 circle | 3.1830989 1/2 circle | 3.5014088 1/2 circle | 3.8197187 1/2 circle | 4.1380286 1/2 circle | 4.4563385 1/2 circle | 4.7746484 1/2 circle | 5.0929583 1/2 circle | 5.4112682 1/2 circle | 5.7295780 1/2 circle | 6.0478879 1/2 circle | 6.3661978 1/2 circle | 6.6845077 1/2 circle | 7.0028176 1/2 circle | 7.3211275 1/2 circle | 7.6394374 1/2 circle | 7.9577473 1/2 circle | 8.2760572 1/2 circle | 8.5943671 1/2 circle | 8.9126770 1/2 circle | 9.2309869 1/2 circle | 9.5492967 1/2 circle | 9.8676066 1/2 circle | 10.1859165 1/2 circle | 10.5042264 1/2 circle | 10.8225363 1/2 circle | 11.1408462 1/2 circle | 11.4591561 1/2 circle | 11.7774660 1/2 circle | 12.0957759 1/2 circle | 12.4140858 1/2 circle | 12.7323957 1/2 circle | 13.0507056 1/2 circle | 13.3690154 1/2 circle | 13.6873253 1/2 circle | 14.0056352 1/2 circle | 14.3239451 1/2 circle | 14.6422550 1/2 circle | 14.9605649 1/2 circle | 15.2788748 1/2 circle | 15.5971847 1/2 circle | 15.9154946 1/2 circle | 16.2338045 1/2 circle | 16.5521144 1/2 circle | 16.8704243 1/2 circle | 17.1887341 1/2 circle | 17.5070440 1/2 circle | 17.8253539 1/2 circle | 18.1436638 1/2 circle | 18.4619737 1/2 circle | 18.7802836 1/2 circle | 19.0985935 1/2 circle | 19.4169034 1/2 circle | 19.7352133 1/2 circle | 20.0535232 1/2 circle | 20.3718331 1/2 circle | 20.6901430 1/2 circle | 21.0084528 1/2 circle | 21.3267627 1/2 circle | 21.6450726 1/2 circle | 21.9633825 1/2 circle | 22.2816924 1/2 circle | 22.6000023 1/2 circle | 22.9183122 1/2 circle | 23.2366221 1/2 circle | 23.5549320 1/2 circle | 23.8732419 1/2 circle | 24.1915518 1/2 circle | 24.5098617 1/2 circle | 24.8281715 1/2 circle | 25.1464814 1/2 circle | 25.4647913 1/2 circle | 25.7831012 1/2 circle | 26.1014111 1/2 circle | 26.4197210 1/2 circle | 26.7380309 1/2 circle | 27.0563408 1/2 circle | 27.3746507 1/2 circle | 27.6929606 1/2 circle | 28.0112705 1/2 circle | 28.3295804 1/2 circle | 28.6478902 1/2 circle | 28.9662001 1/2 circle | 29.2845100 1/2 circle | 29.6028199 1/2 circle | 29.9211298 1/2 circle | 30.2394397 1/2 circle | 30.5577496 1/2 circle | 30.8760595 1/2 circle | 31.1943694 1/2 circle | 31.5126793 1/2 circle | 31.8309892 1/2 circle |
The radian is the standard unit of angular measure, used in many areas of mathematics. The length of an arc of a unit circle is numerically equal to the measurement in radians of the angle that it subtends; one radian is just under 57.3 degrees.
| 1 radians = 0.31830989161357 helf circles | 6 radians = 1.9098593496814 helf circles |
| 2 radians = 0.63661978322714 helf circles | 7 radians = 2.228169241295 helf circles |
| 3 radians = 0.95492967484072 helf circles | 8 radians = 2.5464791329086 helf circles |
| 4 radians = 1.2732395664543 helf circles | 9 radians = 2.8647890245221 helf circles |
| 5 radians = 1.5915494580679 helf circles | 10 radians = 3.1830989161357 helf circles |
1/2 circle or half circle is equal to 360°/2 = 180°. Plural name is helf circles.
| 1 helf circles = 3.1415926 radians | 6 helf circles = 18.8495556 radians |
| 2 helf circles = 6.2831852 radians | 7 helf circles = 21.9911482 radians |
| 3 helf circles = 9.4247778 radians | 8 helf circles = 25.1327408 radians |
| 4 helf circles = 12.5663704 radians | 9 helf circles = 28.2743334 radians |
| 5 helf circles = 15.707963 radians | 10 helf circles = 31.415926 radians |
| 1 radians = 0.3183099 helf circles |
| 1 helf circles = 3.1415926 radians |