IMO Mathematics Olympiad (SOF) Class 9: Questions 280  284 of 919
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Question number: 280
Question
The ratio between the length and the breadth of a rectangular park is. If a man cycling along the boundary of the park at the speed of 15 km/hr completes one round in 12 minutes, then the area of the park is________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 281
» Lines, Angles and Quadrilaterals
Question
Two regular polygons are such that the ratio between their no. of sides is 1: 2 and the ratio of measures of their interior angles is 3: 4. Find the number of sides of each polygon.
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Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 282
Question
In the medians XC, YB and ZA pass through O. If , then YB is ________
Choices
Choice (4)  Response  

a.  19 

b.  11 

c.  26 

d.  21 

Question number: 283
Question
In the figure , and . If the exterior angle XZK is, then the angle NMX is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 284
Question
The number of spherical balls each 4 cm in diameter be made out of a rectangular solid is ________
Choices
Choice (4)  Response  

a.  107 

b.  109 

c.  102 

d.  105 
