How many gallons of paint does it take to cover a room whose walls have an area of 800 m²

Can somebody me out with this 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

1. find the area of the unshaded square 2. find the area of the large square 3. what is the area of the frame represented by the shaded region show