IMO Mathematics Olympiad (SOF) Class 9: Questions 345  349 of 919
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Question number: 345
Question
A spherical ball of lead, 3 cm in diameter is melted and recast into three spherical balls. The diameter of two of these is 1.5 cm and 2 cm respectively. The radius of the third ball is________.
Choices
Choice (4)  Response  

a.  3 cm 

b.  2.5 cm 

c.  3.5 cm 

d.  2.66 cm 

Question number: 346
» Lines, Angles and Quadrilaterals
Question
The sum of the interior angles of a polygon is three times the sum of its exterior angles. Then number of sides in a polygon is ________.
Choices
Choice (4)  Response  

a.  8 

b.  9 

c.  5 

d.  7 

Question number: 347
Question
Write the coordinate of each the points J, K, L, M, N and O from the figure
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 348
» Lines, Angles and Quadrilaterals
Question
In parallelogram ABCD. . The altitudes corresponding to the sides CD and AD are respectively 9 cm and 11 cm. Find AD.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 349
Question
ABC is triangle in which BE, CF are medians. If , and , then the area of is________
Choices
Choice (4)  Response  

a.  240 

b.  120 

c.  102 

d.  360 
