# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 139 - 147 of 931

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## Question 139

### Question

MCQ▾In the given figure, , and , find

### Choices

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

a. | 45˚ | |

b. | 50˚ | |

c. | 60˚ | |

d. | 55˚ |

## Question 140

### Question

MCQ▾In the given figure, and . Then ∠ FCD is ________.

### Choices

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

a. | 120˚ | |

b. | 60˚ | |

c. | 45 | |

d. | 90˚ |

## Question 141

### Question

MCQ▾If , and , then x and y respectively are ________

### Choices

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

a. | 40˚, 30˚ | |

b. | 30˚, 45˚ | |

c. | 50˚, 77˚ | |

d. | 90˚, 30˚ |

## Question 142

### Question

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

### Choices

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

a. | Rhombus | |

b. | Trapezium | |

c. | Rectangle | |

d. | Square |

## Question 143

### Question

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

### Choices

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

a. | 80˚ | |

b. | 85˚ | |

c. | 90˚ | |

d. | 95˚ |

## Question 144

## Question 145

### Question

MCQ▾In the figure , find ________

### Choices

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

a. | 120˚ | |

b. | 105˚ | |

c. | 100˚ | |

d. | 115˚ |

## Question 146

### Question

MCQ▾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 147

### Question

MCQ▾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 |