sin77Sin 77 Degrees The sin of 77 degrees is 0.97437, the same as sin of 77 degrees in radians. To obtain 77 degrees in radian multiply 77° by π 180° = 77180 πSin 77 Degrees The sin of 77 degrees is 0.97437, the same as sin of 77 degrees in radians. To obtain 77 degrees in radian multiply 77° by π 180° = 77180 π