- 1 : 3
- 1 : 2
- 3 : 1
- 1 : 5

Option 1 : 1 : 3

**Given**

The corresponding sides of two similar triangles are in the ratio of 1 : 3.

**Concept used**

Ratio of sides = Ratio of heights (altitudes)

**Calculation**

Ratio of sides = Ratio of altitudes

Two similar triangles with their sides of ratio 1 : 3 is given in the question

Ratio of altitude = 1 : 3

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