Answer
Estimate: 20 $\times$ 10 = 200 $ft^{2}$
Exact = 252 $ft^{2}$
Work Step by Step
We need to find the Area (which is rectange).
Area = length $\times$ width
Let's First Find Estimate:
length = 18 (Round off to) 20
width =(9+5) = 14 (Round off to) 10
Estimate: Area: 20 $\times$ 10 = 200 $ft^{2}$
Now Let's find Exact:
Area= 18 $\times$ 14 = 252 $ft^{2}$
