The rectangle is crossed by 9 straight lines parallel to one side of it, and 12 straight
| June 17, 2021 | education
The rectangle is crossed by 9 straight lines parallel to one side of it, and 12 straight lines parallel to the other. How many rectangles are there?
If you draw 9 lines parallel to the side of the rectangle, you get 10 new rectangles. Similarly, if you only draw 12 straight lines parallel to a side, you get 13 new rectangles.
So, if you draw 9 lines parallel to one side and 12 lines parallel to the other side, you get 13 * 10 = 130 rectangles.
Answer: you get 130 rectangles.
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