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A triangle has side lengths of 3, 4, and 5. The perimeter is 12 total. Perimeter is the total length of the outside of the object.
The measure of a perimeter is the total length of all sides of a geometric shape, so any shape with a combination of sides whose total is 27 would yield this perimeter.
add the sides toghther and then you'll have your perimeter of your triangle
The answer depends on total WHAT! Total area, perimeter, sum of interior angles?
The total perimeter can be found by adding the two known sides together - then multiplying by 2 !