# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 158 - 163 of 931

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## Question 158

### Question

MCQ▾The angles of a triangle are in the ratio . The triangle is ________

### Choices

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

a. | Right | |

b. | Scalene | |

c. | Acute | |

d. | Isosceles |

## Question 159

### Question

MCQ▾The measure of an angle is three times the measure of its supplementary angle. Then the angles are________

### Choices

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

a. | 45˚, 135˚ | |

b. | 28˚, 72˚ | |

c. | 26˚, 154˚ | |

d. | 50˚, 100˚ |

## Question 160

### Question

MCQ▾In the given figure . Which of the following must be true?

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 161

### Question

MCQ▾If the bisectors of two adjacent angles A and B of a quadrilateral ABCD intersects at a point O such that , then value of k is ________

### Choices

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

a. | 5 | |

b. | 4 | |

c. | 3 | |

d. | 2 |

## Question 162

### Question

MCQ▾XYZ is an equilateral triangle for side. J, K and L are midpoints of XY, YZ and XZ respectively. The area of triangle JKL is (in) ________

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 163

### Question

MCQ▾The supplementary angle of an angle is one fifth of itself. Then the angle of its supplement are________

### Choices

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

a. | 160˚, 130˚ | |

b. | 150˚, 30˚ | |

c. | 160˚, 20˚ | |

d. | 150˚, 45˚ |