# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 145 - 151 of 929

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## Question number: 145

» Lines, Angles and Quadrilaterals

### Question

In the figure , find ________

### Choices

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

a. | 120˚ | |

b. | 105˚ | |

c. | 100˚ | |

d. | 115˚ |

## Question number: 146

» 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. | 17 | |

b. | 18 | |

c. | 16 | |

d. | 12 |

## Question number: 147

### 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. | Rationalizing factor | |

b. | Binomial surd | |

c. | Conjugate surd | |

d. | Negative |

## Question number: 148

» Lines, Angles and Quadrilaterals

### Question

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

### Choices

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

a. | 30˚, 60˚ | |

b. | 61˚, 29˚ | |

c. | 24˚, 66˚ | |

d. | 56˚, 34˚ |

## Question number: 149

» Lines, Angles and Quadrilaterals

### Question

In a parallelogram, the sum of the angle bisectors of two adjacent angles is ________

### Choices

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

a. | 60˚ | |

b. | 45˚ | |

c. | 90˚ | |

d. | 30˚ |

## Question number: 150

» Lines, Angles and Quadrilaterals

### Question

The value of x in the given figure is ________

### Choices

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

a. | 20˚ | |

b. | 118˚ | |

c. | 223˚ | |

d. | 72˚ |

## Question number: 151

» Lines, Angles and Quadrilaterals

### Question

In the figure, if , then x = ________

### Choices

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

a. | 30˚ | |

b. | 60˚ | |

c. | 29˚ | |

d. | 45˚ |