sin77Calculate the value of the sin of 720 ° To enter an angle in radians, enter sin(720RAD) sin(720 °) = -4.89842541528951E-16 Sine, in mathematics, is a tronometric function of an angle.Sin 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