IMO Mathematics Olympiad (SOF) Class 9: Questions 238  242 of 919
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Question number: 238
Question
On plotting the points A (2, 9), B (6, 11), C (10, 9), D (8, 5), E (4, 5) and joining AB, BC, CD, CE, EA, Which of the following figure is obtained?
Choices
Choice (4)  Response  

a.  Parallelogram 

b.  Hexagon 

c.  Trapezoid 

d.  Pentagon 

Question number: 239
Question
Squares ABCD and EFGH are congruent, and G is the center of square ABCD. The area of the shaded region in the plane is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 240
Question
27 metal balls each of radius r are melted together to from one big sphere of radius R. Then the ratio of surface area of the big sphere to that of a ball is ________
Choices
Choice (4)  Response  

a.  3 

b.  9 

c. 


d. 


Question number: 241
» Lines, Angles and Quadrilaterals
Question
A running track is the ring formed by two concentric circles. It is 15 feet wide. The circumferences of the two circles differ by about ________
Choices
Choice (4)  Response  

a.  75 feet 

b.  94 feet 

c.  65 feet 

d.  90 feet 

Question number: 242
» Lines, Angles and Quadrilaterals
Question
From the adjoining figure . The value of x is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

