The perimeter of a triangle will be the addition of all the lengths if its sides.
It should be noted that your information is incomplete but an overview will be given based on the information. It should be noted that a perimeter of a triangle is the addition of all its three sides.
In this case, let's assume that the previous triangle has a perimeter of 30cm. This implies that you've to draw another triangle that its three sides will be equal to 30cm too.
The sides length can be 10cm, 8cm and 12cm. Also, you can use 10cm, 10cm, and 10cm. This will give the perimeter.
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