SOLUTION: The length of a rectangle plus its width is 20cm, the area is 36 square cm. What are the length and the width of the triangle.

Question 429099: The length of a rectangle plus its width is 20cm, the area is 36 square cm. What are the length and the width of the triangle.
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
If the length of a rectangle plus its width is 20cm, then its' length is 20cm minus its width. Also, we know that the rectangle's total area is 36 sq.cm.. Thus we have:
X(20-X) = 36
20X-X^2 = 36
20X-36 =X^2
0 = X^2-20X+36
0 = (X-18)(X-2)
Thus the dimensions of our rectangle are 18cm X 2cm.
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