Little help please what are the values of sin X and cos x?

What is the measure of angle afe? 79 81 91 99

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)

Choose the more precise measurement. 26.4 cm or 8.39 cm