$\"\"$ $\"\"$

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The perimeter P of a triangle is given by the formula, $\"\"$

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Where a, b and c are the sides of the triangle

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$\"\"$ $\"\"$

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The perimeter P of a triangle is $\"\"$

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Apply commutative property of addition: $\"\"$ )

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$\"\"$ (Apply associative property of addition: $\"\"$ )

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$\"\"$ (Apply commutative property of addition: $\"\"$ )

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$\"\"$

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$\"\"$ (Add: $\"\"$ )

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$\"\"$ (Apply commutative property of addition: $\"\"$ )

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$\"\"$ (Add: $\"\"$ ) $\"\"$

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The perimeter P of a triangle is $\"\"$ .