I need to find the ratio of this

What is a graph with a never ending line called?

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)

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.