We used our pentomino pieces to explore area and perimeter and review symmetry. The 12 pentomino pieces are given names based on the letters they resemble. Finding the perimeter of the pentomino shapes was pretty easy, but when we tried to find the perimeter of a leaf later we realized how tricky perimeter can be. Some of us were surprised to discover that even though the area of the pentomino shapes was always five, the perimeter was different depending on the shape. The P shape had a perimeter of 10, which was the smallest. The other shapes (F, I, L, N, W, X, Y, Z, T, U, and V) all had a perimeter of 12.
The shape with the most lines of symmetry was the letter X.
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