Question 404082
Remember, the area of a triangle is 1/2bh  where b is the base and h is the height
The area for the flag cannot be more than 180 since that's how much cloth there is.  Also, the base is given, 18.  So let's set up our equation.
1/2(18)h≤180  
9h≤180  Simplify
/9 /9  Division property of equality
h≤20  Simplify
So the maximum height is 20 inches.