# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 418 - 423 of 931

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## Question 418

### Question

MCQ▾The altitude drawn to the base of an isosceles triangle is of length 6 cm and the perimeter is 72 cm. the area of the triangle is ________

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Choice (4) | Response | |
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d. |

## Question 419

### Question

MCQ▾A rectangular field has its length and breadth in the ratio . Its area is 10.29 hectares. The cost of fencing it at ₹ . 8 per meter is ________

### Choices

Choice (4) | Response | |
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a. | ₹ 21500 | |

b. | ₹ 15400 | |

c. | ₹ 14200 | |

d. | ₹ 11200 |

## Question 420

### Question

MCQ▾The volume of the largest circular cone that can be cut of a cube whose edge is 16 cm is ________

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## Question 421

### Question

MCQ▾In the figure , and . Then x equals ________.

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d. |

## Question 422

### Question

MCQ▾From each corner of a square of side 6 cm a quadrant of a circle of radius 2 cm is cut and also a circle of diameter 4 cm is cut as shown in the figure, then the area of the remaining portion of the square is ________

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## Question 423

### Question

MCQ▾A line passed through the point (3,6) and has gradient . Find the y-coordinate of a point on the line when x = 11.

### Choices

Choice (4) | Response | |
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a. | 14 | |

b. | 13 | |

c. | 15 | |

d. | 12 |