# IMO- Mathematics Olympiad Class 9: Questions 398 - 401 of 919

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## Question number: 398

MCQ▾

### Question

The sides BC, CA and AB of are produces in order to form exterior angles and, then is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 399

MCQ▾

### Question

In the adjoining figure, Line p and q are transversals, then ST = ________

### Choices

Choice (4) Response

a.

12 units

b.

10 units

c.

14 units

d.

15 units

## Question number: 400

MCQ▾

### Question

In the medians PS, QT and RU pass through O. if, and then OS is ________

### Choices

Choice (4) Response

a.

2.6

b.

2.5

c.

2.9

d.

2.3

## Question number: 401

MCQ▾

### Question

What change in percent is made in the area of a rectangle by decreasing its length and increasing its breadth by ?

### Choices

Choice (4) Response

a.

b.

c.

d.

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