IMO Mathematics Olympiad Class 9: Questions 125  129 of 919
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Question number: 125
» Lines, Angles and Quadrilaterals
Question
The angles of a triangle are in the ratio . The triangle is ________
Choices
Choice (4)  Response  

a.  Isosceles 

b.  Acute 

c.  Obtuse 

d.  Question does not provide sufficient data or is vague 

Question number: 126
» Lines, Angles and Quadrilaterals
Question
The given figure PQRS is a parallelogram then the values of and are________
Choices
Choice (4)  Response  

a.  45˚, 60˚ 

b.  70˚, 35˚ 

c.  35˚, 70˚ 

d.  60˚, 45˚ 

Question number: 127
» Lines, Angles and Quadrilaterals
Question
In the figure, a is greater than b by one fifth of a right angle. Then a, b respectively are________
Choices
Choice (4)  Response  

a.  120˚, 110˚ 

b.  50˚, 120˚ 

c.  130˚, 60˚ 

d.  99˚, 81˚ 

Question number: 128
» Lines, Angles and Quadrilaterals
Question
In the figure, if , then x = ________
Choices
Choice (4)  Response  

a.  60˚ 

b.  70˚ 

c.  45˚ 

d.  55˚ 

Question number: 129
Question
In the adjoining figure, circles with centres at L, M and N each have a radius of 2 units and are placed as shown here. If PQRS is the smallest rectangle that will enclose the 3 circles, what is the area of PQRS?
Choices
Choice (4)  Response  

a.  16 sq. units 

b.  12 sq. units 

c.  8 sq. units 

d.  32 sq. units 
