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### This Is a Certified Answer

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*Perimeter of a triangle is the SUM OF ALL ITS SIDES.*

*If there is a triangle with its:*

*Side1 = 3cm, Side 2 = 4cm and Side 3 = 5cm*

*Then the perimeter of the triangle will be:*

*PERIMETER= Side1 + Side2 +Side3*

*Perimeter= (3+4+5)cm = 12cm*
The Brainliest Answer!

P=a+b+c;

where a,b & c are the lengths of the three sides of a triangle.

Eg:

a triangle has three sides measuring....15cm,12cm & 14 cm;

therefore its perimeter=15cm+12cm+14cm=41cm.

hope i helped u:)