Convert the decimal expansion 0.1777 into a rational number.

1777/10000. might simplify

Answer d; a supplementary angle = 180°, so if that angle = 150°, y would = 30°.

Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.