How do you find v and what does simplest radical form mean?

How many square feet of out door carpet will we need for this hole? 8ft 3ft 12ft 4ft

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

Will mark brainliest! ( explain the answer too, it can be one sentence)