willis constructed a horizontal shelf that extends perpendicularly from a wall and is held up by a 34-centimeter brace. the shelf makes a 28° angle with the brace as shown. To make the shelf, Willis began with a 55-centimeter piece of wood and then shortened it by cutting a portion off. about how many centimeters did he cut off. A. 21 B. 25 C. 30 D. 34