# Comparing areas?

The area decreases from $225 c {m}^{2}$ to $100 c {m}^{2}$, which is a decrease of $125 c {m}^{2}$
Initially, the sides of a square is 15cm long. The area initially (which you got) is $A r e a = L \cdot W = 15 \cdot 15 = 225$
If all 4 sides are decreased by 5cm, it means that instead of all the sides being 15, it is now 10cm. ($15 - 5 = 10$) So the new area of the square is $A r e a = L \cdot W = 10 \cdot 10 = 100$
To find the total decrease, we take the original area and subtract it by the new area. $225 - 100 = 125$ So this is therefore a decrease of $125 c {m}^{2}$ from the original area.