IMO Level 1 Mathematics Olympiad (SOF) Class 9: Questions 158  163 of 929
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Question number: 158
» Lines, Angles and Quadrilaterals
Question
The angles of a triangle are in the ratio . The triangle is ________
Choices
Choice (4)  Response  

a.  Right  
b.  Scalene  
c.  Acute  
d.  Isosceles 
Question number: 159
» Lines, Angles and Quadrilaterals
Question
The measure of an angle is three times the measure of its supplementary angle. Then the angles are________
Choices
Choice (4)  Response  

a.  45˚, 135˚  
b.  28˚, 72˚  
c.  26˚, 154˚  
d.  50˚, 100˚ 
Question number: 160
» Lines, Angles and Quadrilaterals
Question
In the given figure . Which of the following must be true?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 161
» Lines, Angles and Quadrilaterals
Question
If the bisectors of two adjacent angles A and B of a quadrilateral ABCD intersects at a point O such that , then value of k is ________
Choices
Choice (4)  Response  

a.  5  
b.  4  
c.  3  
d.  2 
Question number: 162
» Lines, Angles and Quadrilaterals
Question
XYZ is an equilateral triangle for side . J, K and L are midpoints of XY, YZ and XZ respectively. The area of triangle JKL is (in ) ________
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 163
» Lines, Angles and Quadrilaterals
Question
The supplementary angle of an angle is one fifth of itself. Then the angle of its supplement are________
Choices
Choice (4)  Response  

a.  160˚, 130˚  
b.  150˚, 30˚  
c.  160˚, 20˚  
d.  150˚, 45˚ 