# IMO- Mathematics Olympiad Class 9: Questions 143 - 149 of 919

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## Question number: 143

» Lines, Angles and Quadrilaterals

### Question

If the diagonals of a parallelogram are equal, then it is a ________

### Choices

Choice (4) | Response | |
---|---|---|

a. | Trapezium | |

b. | Rectangle | |

c. | Rhombus | |

d. | Square |

## Question number: 144

» Lines, Angles and Quadrilaterals

### Question

In the given figure and , then value of x is________.

### Choices

Choice (4) | Response | |
---|---|---|

a. | 90˚ | |

b. | 80˚ | |

c. | 85˚ | |

d. | 95˚ |

## Question number: 145

### Question

Value of

### Choices

Choice (4) | Response | |
---|---|---|

a. | 1 | |

b. | -1 | |

c. | x | |

d. | 0 |

## Question number: 146

» Lines, Angles and Quadrilaterals

### Question

In the figure , find ________

### Choices

Choice (4) | Response | |
---|---|---|

a. | 115˚ | |

b. | 120˚ | |

c. | 105˚ | |

d. | 100˚ |

## Question number: 147

» Lines, Angles and Quadrilaterals

### Question

How many sides does a regular polygon have, each angle of which is of measure 150˚?

### Choices

Choice (4) | Response | |
---|---|---|

a. | 16 | |

b. | 18 | |

c. | 12 | |

d. | 17 |

## Question number: 148

### Question

If the product of two surds is a rational number, then each one of them is called the ________ of the other________

### Choices

Choice (4) | Response | |
---|---|---|

a. | Negative | |

b. | Rationalizing factor | |

c. | Conjugate surd | |

d. | Binomial surd |

## Question number: 149

» Lines, Angles and Quadrilaterals

### Question

If two complementary angles are in the ratio 4: 11, then the angles are________

### Choices

Choice (4) | Response | |
---|---|---|

a. | 56˚, 34˚ | |

b. | 61˚, 29˚ | |

c. | 24˚, 66˚ | |

d. | 30˚, 60˚ |