**Input image:**

**Showing:**

**Projection:**

**Projection:**

**Projection:**

**Generating Elements:**

**Generating Elements:**

**Number of elements:**

**Basic triangle** (heavy lines)

Rotational symmetries at intersection between:

straight lines | |

circle and upper line | |

circle and lower line |

sum of angles =

**Center circle:** (medium line)

Rotational symmetries at intersection with

basic circle | |

upper line | |

lower line |

**Center circle:** (medium line)

Size:

Rotational symmetries at intersection with

upper line | |

lower line |

**Inner circle:** (light line)

Rotational symmetries at intersection with

center circle | |

upper line | |

lower line |

**Output image:**

**Output image size:**