**Formula list of figures **

Name | Figure | Perimeter | Area in square |

Rectangle | a = length b = breadth | 2(a + b) | ab |

Square | a = side | 4a | a^2 1/2 (diagonal)^2 |

Parallelogram | a = side b = side adjacent to a h = distance between the opp. parallel sides | 2(a + b) | ah |

Rhombus | a = side of rhombus; d1,d2 are the two diagonals | 4a | 1/2*d1*d2 |

Quadrilateral | AC is one of its diagonalsand h1, h2 are the altitudes on AC from D, B respectively. | Sum of its four Sides | 1/2 (AC) (h1 + h2) |

Trapezium | a, b, are parallel sides and h is the distance between parallel sides | Sum of its four sides | 1/2 h(a + b) |

Triangle | b is the base and h is the altitude.a, b, c are three sides | a + b + c = 2s | 1/2 b × h or s(s - a)(s -b)(s - c) |

Right triangle | d^2(hypotenuse)= b^2 + h^2 | b + h + d | 1/2 bh |

Equilateral triangle | a = side h = altitude =root(3)/2 a | 3a | (i)1/2 ah (ii)root(3)/4 a^2 |

Isosceles Triangle | c = unequal side a = equal side | 2a + c | C* root(4a^2 - c^2)/ 4 |

Isosceles Right Triangle | d(hypotenuse)= a Root(2) a = Each of equal sides. The angles are 90,45, 45. | 2a + d | 1/2 a2 |

Circle | r = radius of the circle p- =22/7 or 3.1416 | 2pi r | pi* ^2 |

Semicircle | r = radius of the circle | pr + 2r | 1/2*pi*r^2 |