If the base of rectangle is increased by 10 % and the area is unchanged then the corresponding altitude must be decreased by:________? August 3, 2021July 15, 2019 by admin If the base of rectangle is increased by 10 % and the area is unchanged then the corresponding altitude must be decreased by:________? A. 9 1/11 % B. 10% C. 11% D. 11 1/9 %