IMO Mathematics Olympiad (SOF) Class 9: Questions 121  125 of 919
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Question number: 121
» Lines, Angles and Quadrilaterals
Question
If l, m, n are three parallel lines and the transversals t1 and t2 cut the lines l, m, n at the points A, B, C and P, Q, R as shown in the figure, then________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 122
» Lines, Angles and Quadrilaterals
Question
The angles of quadrilateral are in the ratio . All angles of a quadrilaterals are________
Choices
Choice (4)  Response  

a.  72˚, 36˚, 108˚, 144˚ 

b.  36˚, 60˚, 20˚, 156˚ 

c.  145˚, 20˚, 30˚, 60˚ 

d.  108˚, 144˚, 45˚, 15˚ 

Question number: 123
» Lines, Angles and Quadrilaterals
Question
In figure PQ, RS and TU are three lines concurrent at A. If ∠PAU = 6y˚, ∠QAS = 4y˚ and ∠RAT = 2y˚, the value of y is________
Choices
Choice (4)  Response  

a.  15 

b.  25 

c.  30 

d.  20 

Question number: 124
» Lines, Angles and Quadrilaterals
Question
The complementary angle of an angle is one fourth of itself. Then the angle of its complement are________
Choices
Choice (4)  Response  

a.  45˚, 45˚ 

b.  72˚, 18˚ 

c.  60˚, 30˚ 

d.  55˚, 35˚ 

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 
