# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 139 - 147 of 931

Access detailed explanations (illustrated with images and videos) to 931 questions. Access all new questions- tracking exam pattern and syllabus. View the complete topic-wise distribution of questions. Unlimited Access, Unlimited Time, on Unlimited Devices!

View Sample Explanation or View Features.

Rs. 450.00 -OR-

## Question 139

### Question

MCQ▾

In the given figure, , and , find

### Choices

Choice (4)Response

a.

45˚

b.

50˚

c.

60˚

d.

55˚

## Question 140

### Question

MCQ▾

In the given figure, and . Then ∠ FCD is ________.

### Choices

Choice (4)Response

a.

120˚

b.

60˚

c.

45

d.

90˚

## Question 141

### Question

MCQ▾

If , and , then x and y respectively are ________

### Choices

Choice (4)Response

a.

40˚, 30˚

b.

30˚, 45˚

c.

50˚, 77˚

d.

90˚, 30˚

## Question 142

### Question

MCQ▾

If the diagonals of a parallelogram are equal , then it is a ________

### Choices

Choice (4)Response

a.

Rhombus

b.

Trapezium

c.

Rectangle

d.

Square

## Question 143

### Question

MCQ▾

In the given figure and , then value of x is________.

### Choices

Choice (4)Response

a.

80˚

b.

85˚

c.

90˚

d.

95˚

## Question 144

MCQ▾

Value of

### Choices

Choice (4)Response

a.

-1

b.

0

c.

x

d.

1

## Question 145

### Question

MCQ▾

In the figure , find ________

### Choices

Choice (4)Response

a.

120˚

b.

105˚

c.

100˚

d.

115˚

## Question 146

### Question

MCQ▾

How many sides does a regular polygon have, each angle of which is of measure 150˚?

### Choices

Choice (4)Response

a.

17

b.

18

c.

16

d.

12

## Question 147

### Question

MCQ▾

If the product of two surds is a rational number, then each one of them is called the ________ of the other________

### Choices

Choice (4)Response

a.

Rationalizing factor

b.

Binomial surd

c.

Conjugate surd

d.

Negative