SOLUTION: A sheet of paper is yellow on the top side and blue on the bottom side. The lower-right corner is folded to the left side of the paper so that the resulting figure is a yellow rect

Algebra ->  Formulas -> SOLUTION: A sheet of paper is yellow on the top side and blue on the bottom side. The lower-right corner is folded to the left side of the paper so that the resulting figure is a yellow rect      Log On


   

Question 106922: A sheet of paper is yellow on the top side and blue on the bottom side. The lower-right corner is folded to the left side of the paper so that the resulting figure is a yellow rectangle above a blue triangle. The width of the paper is 10 cm, and equal areas of blue and yellow appear after the folding. What is the area of one side of the paper.
Answer by scott8148(6628) About Me  (Show Source):
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the blue triangle is half of a 10 X 10 square, so it has an area of 50

this means the yellow rectangle also has an area of 50

so the area of one side of the paper (with the triangle unfolded) is 150