Properties of tetromino — lesson. Mathematics State Board, Class 7.

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Tertrominoes are observed (or) assumed as if they are fixed into only being in "Orthogonal" rotations.

"Orthogonal" refers to being lined up with the horizontal and vertical axes.

Properties:

Mirror symmetry can occur only along

$2$ axes.

Reflection along the horizontal axes is called the

$X$ -Reflection.

Reflection along the vertical axes is called the

$Y$ -Reflection.

Every tetromino can have

$1$ of

$4$ possible symmetries. ("Symmetric with

$Y$ " (or) "Symmetric with

$X$ " (or) "Symmetric to both" (or) "Asymmetric").

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4. Properties of tetromino