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You find the three sides of the triangle, and assure that they are all in the same unit, and then add the sides together to find the perimeter of the triangle.

Q: How to measure a triangles perimeter?

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They don't always- they don't always 'has' a smaller perimeter than other triangles. A triangle can be absolutely any size as long as it has three sides and angles that add to 180 degrees

fu

two isosceles triangles with common line

The perimeter of any triangle is the sum of its 3 sides

An infinite number are possible.

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They don't always- they don't always 'has' a smaller perimeter than other triangles. A triangle can be absolutely any size as long as it has three sides and angles that add to 180 degrees

Infinitely many.

fu

two isosceles triangles with common line

you can't, because the Pythagorean theorem is for right triangles and the triangles formed by the diagonal of a parallelogram are not right triangles.

The perimeter of any triangle is the sum of its 3 sides

An infinite number are possible.

You can't tell. There are an infinite number of triangles that all have a perimeter of 144.

to measure the perimeter we need a figure with boundaries and all the sides with dimensions

You simply just add up all of the sides

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