Which one is bigger?

In 1L we are now looking at triangles, and other shapes. We wondered which was bigger, the rectangle or the triangle….

or which was bigger, the rectangle or the parallelogram….

We had a good discussion, and compared the two. Each of the shapes has the same area, as they were made by cutting the rectangle along the diagonal, and then rearranging the pieces. The perimeter is not the same for the shapes though!

We determined that the area of a triangle is half of the area of the rectangle that it came from.