If a is the center of the circle which of these is our a radii

Which fraction below is equivalent to 10/12?

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin