# Triangles and Circles (IMO- Mathematics Olympiad (SOF) Class 9): Questions 23 - 27 of 79

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## Question number: 23

» Triangles and Circles

MCQ▾

### Question

A running track is the ring formed by two concentric circles. It is 10 feet wide. The circumferences of the two circles differ by about ________.

### Choices

Choice (4) Response

a.

100 feet

b.

10 feet

c.

30 feet

d.

60 feet

## Question number: 24

» Triangles and Circles

MCQ▾

### Question

In triangle HKM, the altitude from H to KM meets KM at J, and the altitude from K to HM meets HJ at S. if , and , if then the length of SJ is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 25

» Triangles and Circles

MCQ▾

### Question

In the medians XC, YB and ZA pass through O. If , then YB is ________

### Choices

Choice (4) Response

a.

19

b.

11

c.

26

d.

21

## Question number: 26

» Triangles and Circles

MCQ▾

### Question

In the figure , and . If the exterior angle XZK is, then the angle NMX is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 27

» Triangles and Circles

MCQ▾

### Question

The and are right angles. If , and , then the length of BD is ________

### Choices

Choice (4) Response

a.

25 cm

b.

15 cm

c.

12 cm

d.

16 cm

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