.45 is just 45/100. divide both numbers by 5 to get 9/20.
I don't feel like working it out/ maybe someone will give you the answer/ but basically you would set
and add it to
to equal 180( which is the degree of a line
so it looks like this:
and then solve( tell me if you need more clarification)
Let say the length of the rectangle is x. The material that can be used would determine the perimeter of the rectangle. Using the perimeter formula you can find the rectangle width
perimeter= 2(width+length)
400= 2(width + x)
200= width+x
width= 200-x
The function to determine the area would be:
area= length * width
area= x* (200-x)
area= 200x- x^2
To find the highest area you need to find out the vertex by finding the value of x when the differentiate of the function equal to zero.
dx/dy= 200- 2x = 0
2x= 200
x=100
If you put x=100 into the area function you will find
area= 200x- x^2
area= 200(100)- (100)^2
area= 20,000 - 10,000= 10000 feet^2
The answer is 7m because if you look at the measurements of the left triangle, they are multiplied by 3 to get the measurements on the right side.