Can the Tile Below Be Used to Tile the Plane

question 77

Multiple Choice

Can the tile below be used to tile the plane?

• A) no
• B) yes, with translations only
• C) yes, with translations and half-turns only
• D) yes, but reflections must be included

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Definitions:

Immune System

The body’s defense mechanism against pathogens, comprising physical barriers, cells, and proteins that work together to prevent and fight infections.

Fraternal Birth-Order Effect

A phenomenon in which the chances of a man being homosexual are thought to increase with the number of older brothers he has.

Male Fetuses

Male fetuses are unborn offspring in the process of development, from the time of conception until birth, that are genetically characterized as male based on sex chromosomes.

Initiate Sex

The action of making the first move or proposal to engage in sexual activity with another person.