| quarter circle | 1 1/4 circle | 2 1/4 circle | 3 1/4 circle | 4 1/4 circle | 5 1/4 circle | 6 1/4 circle | 7 1/4 circle | 8 1/4 circle | 9 1/4 circle | 10 1/4 circle | 11 1/4 circle | 12 1/4 circle | 13 1/4 circle | 14 1/4 circle | 15 1/4 circle | 16 1/4 circle | 17 1/4 circle | 18 1/4 circle | 19 1/4 circle | 20 1/4 circle | 21 1/4 circle | 22 1/4 circle | 23 1/4 circle | 24 1/4 circle | 25 1/4 circle | 26 1/4 circle | 27 1/4 circle | 28 1/4 circle | 29 1/4 circle | 30 1/4 circle | 31 1/4 circle | 32 1/4 circle | 33 1/4 circle | 34 1/4 circle | 35 1/4 circle | 36 1/4 circle | 37 1/4 circle | 38 1/4 circle | 39 1/4 circle | 40 1/4 circle | 41 1/4 circle | 42 1/4 circle | 43 1/4 circle | 44 1/4 circle | 45 1/4 circle | 46 1/4 circle | 47 1/4 circle | 48 1/4 circle | 49 1/4 circle | 50 1/4 circle | 51 1/4 circle | 52 1/4 circle | 53 1/4 circle | 54 1/4 circle | 55 1/4 circle | 56 1/4 circle | 57 1/4 circle | 58 1/4 circle | 59 1/4 circle | 60 1/4 circle | 61 1/4 circle | 62 1/4 circle | 63 1/4 circle | 64 1/4 circle | 65 1/4 circle | 66 1/4 circle | 67 1/4 circle | 68 1/4 circle | 69 1/4 circle | 70 1/4 circle | 71 1/4 circle | 72 1/4 circle | 73 1/4 circle | 74 1/4 circle | 75 1/4 circle | 76 1/4 circle | 77 1/4 circle | 78 1/4 circle | 79 1/4 circle | 80 1/4 circle | 81 1/4 circle | 82 1/4 circle | 83 1/4 circle | 84 1/4 circle | 85 1/4 circle | 86 1/4 circle | 87 1/4 circle | 88 1/4 circle | 89 1/4 circle | 90 1/4 circle | 91 1/4 circle | 92 1/4 circle | 93 1/4 circle | 94 1/4 circle | 95 1/4 circle | 96 1/4 circle | 97 1/4 circle | 98 1/4 circle | 99 1/4 circle | 100 1/4 circle |
| radian | 1.5707963 rad | 3.1415926 rad | 4.7123889 rad | 6.2831852 rad | 7.8539815 rad | 9.4247778 rad | 10.9955741 rad | 12.5663704 rad | 14.1371667 rad | 15.707963 rad | 17.2787593 rad | 18.8495556 rad | 20.4203519 rad | 21.9911482 rad | 23.5619445 rad | 25.1327408 rad | 26.7035371 rad | 28.2743334 rad | 29.8451297 rad | 31.415926 rad | 32.9867223 rad | 34.5575186 rad | 36.1283149 rad | 37.6991112 rad | 39.2699075 rad | 40.8407038 rad | 42.4115001 rad | 43.9822964 rad | 45.5530927 rad | 47.123889 rad | 48.6946853 rad | 50.2654816 rad | 51.8362779 rad | 53.4070742 rad | 54.9778705 rad | 56.5486668 rad | 58.1194631 rad | 59.6902594 rad | 61.2610557 rad | 62.831852 rad | 64.4026483 rad | 65.9734446 rad | 67.5442409 rad | 69.1150372 rad | 70.6858335 rad | 72.2566298 rad | 73.8274261 rad | 75.3982224 rad | 76.9690187 rad | 78.539815 rad | 80.1106113 rad | 81.6814076 rad | 83.2522039 rad | 84.8230002 rad | 86.3937965 rad | 87.9645928 rad | 89.5353891 rad | 91.1061854 rad | 92.6769817 rad | 94.247778 rad | 95.8185743 rad | 97.3893706 rad | 98.9601669 rad | 100.5309632 rad | 102.1017595 rad | 103.6725558 rad | 105.2433521 rad | 106.8141484 rad | 108.3849447 rad | 109.955741 rad | 111.5265373 rad | 113.0973336 rad | 114.6681299 rad | 116.2389262 rad | 117.8097225 rad | 119.3805188 rad | 120.9513151 rad | 122.5221114 rad | 124.0929077 rad | 125.663704 rad | 127.2345003 rad | 128.8052966 rad | 130.3760929 rad | 131.9468892 rad | 133.5176855 rad | 135.0884818 rad | 136.6592781 rad | 138.2300744 rad | 139.8008707 rad | 141.371667 rad | 142.9424633 rad | 144.5132596 rad | 146.0840559 rad | 147.6548522 rad | 149.2256485 rad | 150.7964448 rad | 152.3672411 rad | 153.9380374 rad | 155.5088337 rad | 157.07963 rad |
1/4 circle or quarter circle is equal to 360°/4 = 90°. Plural name is quarter circles.
| 1 quarter circles = 1.5707963 radians | 6 quarter circles = 9.4247778 radians |
| 2 quarter circles = 3.1415926 radians | 7 quarter circles = 10.9955741 radians |
| 3 quarter circles = 4.7123889 radians | 8 quarter circles = 12.5663704 radians |
| 4 quarter circles = 6.2831852 radians | 9 quarter circles = 14.1371667 radians |
| 5 quarter circles = 7.8539815 radians | 10 quarter circles = 15.707963 radians |
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 = 0.63661978322714 quarter circles | 6 radians = 3.8197186993629 quarter circles |
| 2 radians = 1.2732395664543 quarter circles | 7 radians = 4.45633848259 quarter circles |
| 3 radians = 1.9098593496814 quarter circles | 8 radians = 5.0929582658172 quarter circles |
| 4 radians = 2.5464791329086 quarter circles | 9 radians = 5.7295780490443 quarter circles |
| 5 radians = 3.1830989161357 quarter circles | 10 radians = 6.3661978322714 quarter circles |
| 1 quarter circles = 1.5707963 radians |
| 1 radians = 0.6366198 quarter circles |