The lengths of the sides are 24cm, 27cm and 30cm.
Step-by-step explanation:
The ratio of lengths is 8:9:10
Perimeter = 81 cm
Let x be the length of side.
Therefore,
The length of sides is 8x, 9x and 10x.
Perimeter is the sum of 3 sides, therefore,

Dividing both sides by 27;

Therefore, the lengths of sides are 
The lengths of the sides are 24cm, 27cm and 30cm.
Keywords: triangles, perimeter
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