If the length of a rectangle is increased by 20% and width is decreased by 20% ,what is the change in area of the rectangle?
If the length of a rectangle is increased by 20% and width is decreased by 20% ,what is the change in area of the rectangle? Correct Answer decreases by 4%
ধরি, আয়তের দৈর্ঘ্য = x প্রস্থ = y ∴ ক্ষেত্রফল = xy 20% বৃদ্ধিতে দৈর্ঘ্য = x + 20100x = (1 + 15)x = 56y 20% হ্রাসে প্রস্থ = y - 20100y = (1 - 15)y = 45y ∴ পরিবর্তিত ক্ষেত্রফল = 65x ×45x = 2425xy