## Mathematics Class 9IIT Foundation series is specifically for students preparing for IIT right from school days. The series include books from class 8 to class 10th in physics, chemistry & mathematics. |

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### Contents

HCF Cisterns | 35 |

Formulae | 157 |

Ratio Proportion and Variation | 191 |

Profit and Loss Discount | 233 |

Computing Unitll | 307 |

CHAPTER 12 | 333 |

Mensuration | 401 |

CHAPTER 14 | 437 |

Trigonometry | 487 |

CHAPTER 17 | 513 |

Sales Tax and Cost of Living Index | 541 |

CHAPTER 19 | 555 |

CHAPTER 20 | 579 |

CHAPTER 21 | 607 |

CHAPTER 22 | 621 |

CHAPTER 23 | 647 |

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### Common terms and phrases

AABC amount angle answer type questions antilog arithmetic mean bank base bisector called cheque circle coefficient compound interest Concept Application Level—1 cumulative frequency cyclic quadrilateral decimal deposit accounts diagonal digits elements equal equation x2 Essay type questions Example Find factors Find the number Find the square find the value formula given equation given expression inequations integers Level—3 logarithms matrix mean deviation median monomial Multiply natural numbers number line number of students observations ordered pairs parallelogram percentage perpendicular points for selected polygon polynomial quadratic equation quartile radius rate of interest ratio rational number Rationalize the denominator real numbers relation rhombus selected questions share Short answer type sides significant figures simple interest Simplify Solution Let solve square root Step Substitute surds symmetric symmetric matrix total number triangle type questions 46 venn diagram x-axis Y-axis zero