# IMO Level 1- Mathematics Olympiad (SOF) Class 7: Questions 617 - 623 of 1022

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## Question number: 617

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MCQ▾

### Question

If a, b and c are the sides of an equilateral triangle, then ________.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 618

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MCQ▾

### Question

The three angles of a triangle are in the ratio 1: 2: 3, then the greatest angle is ________.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 619

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MCQ▾

### Question

If the area of a triangle with base x is equal to the area of a rectangle with width x and length double of width, then the altitude of the triangle is ________.

### Choices

Choice (4) Response

a.

b.

2x

c.

6x

d.

4x

## Question number: 620

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MCQ▾

### Question

Two chimneys 16 m and 13 m high stand upright on a ground. If their feet are 4 m apart, then the distance between their tops is ________.

### Choices

Choice (4) Response

a.

31 m

b.

18 m

c.

13 m

d.

5 m

## Question number: 621

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MCQ▾

### Question

The sides of a measure 6 cm, 8 cm and 10 cm. The area of the triangle is ________.

### Choices

Choice (4) Response

a.

b.

c.

d.

All of the above

## Question number: 622

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MCQ▾

### Question

Dimpal earns Rs. 2100 per week working at an office. After taxes, her pay cheque is only 89 % of what she earned. What is the amount payable to Dimpal?

### Choices

Choice (4) Response

a.

1969.00

b.

Rs. 1836.00

c.

Rs. 1869.00

d.

Rs. 1962.00

## Question number: 623

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MCQ▾

### Question

In the figure (not drawn to scale), ABC is an equilateral triangle and BDC is an isosceles triangle with DB = DC, find y.

### Choices

Choice (4) Response

a.

b.

c.

d.