IMO Mathematics Olympiad Class 9: Questions 419  424 of 919
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Question number: 419
Question
If the height of cone is thrice, then its volume is increased by________.
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Question number: 420
Question
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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Question number: 421
Question
A rectangular field has its length and breadth in the ratio . Its area is 10.29 hectares. The cost of fencing it at RS. 8 per meter is ________
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Choice (4)  Response  

a.  Rs. 15400 

b.  Rs. 14200 

c.  Rs. 11200 

d.  Rs. 21500 

Question number: 422
Question
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 number: 423
Question
In the figure , and . Then x equals ________.
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Question number: 424
Question
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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Choice (4)  Response  

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