Mathematics

Grade9

Easy

Question

# Scale factor of A to B is 2: 9. If the perimeter of A is 18 cm, what is the perimeter of B?

- 81 cm
- 27 cm
- 36 cm
- 45 cm

Hint:

### In similar triangles, Ratio of the perimeter of similar triangles is equal to scale factor (or) ratio of corresponding sides.

## The correct answer is: 81 cm

### Ratio of the perimeter of similar triangles = scale factor

Let perimeter of triangle B be x.

Therefore, perimeter of B is 81 cm.

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