IMO Mathematics Olympiad Class 9: Questions 308  312 of 919
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Question number: 308
Question
The volume of a sphere is the curved surface of its sphere is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 309
Question
The area of a quadrilateral PQRS, in which, is an equilateral triangles of side 12 cm and is________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 310
Question
Triangle AXY is formed by three tangents to circle with center Z and, then angle XYZ equals ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 311
Question
A running track is the ring formed by two concentric circles. It is 45 feet wide. The circumferences of the two circles differ by about ________
Choices
Choice (4)  Response  

a.  230 feet 

b.  200 feet 

c.  260 feet 

d.  280 feet 

Question number: 312
Question
If the altitude of an equilateral triangle is , its area is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

