A | B |

triangle | three sides |

hexagon | six sides |

square | four sides |

pentagon | five sides |

equilateral | a triangle with all sides and angles the same length |

scalene | a triangle with all sides different |

isosceles | a triangle with one pair of equal sides and one pair of equal angles |

parallel | lines always the same distance apart |

horizontal | lying down |

vertical | standing up |

angle | where two lines meet |

perpendicular | at right angles to another line |

acute | an angle less than 90° |

obtuse | an angle more than 90°, less than 180° |

right-angle | an angle of 90° |

reflex | an angle which is more than 180° |

heptagonal | seven sided |

circle | 360° |

radius | a line from the centre of a circle to the edge |

diameter | a line from one side of a cricel to the other which goes through the centre |

circumference | the perimeter of a circle |

perimeter | the distance around the outside of a shape |

area | the space enclosed by the perimeter |