Triangles don't have legs, legs implies the triangle's corners are perpendicular to a surface, this chnages the shape of the triangle into a origami shaped object like a small table, which can't exsist fully in 2D.
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Find the perimeter of a right triangle with legs measuring 3 and 4
Pythagorean Theorema2+b2=c2a and b are the legs of the triangle while c is the hypotenuse.To find the hypotenuse, find the largest angle. The hypotenuse is the leg that's directly in front of it. An easy way to remember is that the vertex to the largest angle cannot touch the hypotenuse. You would have to square both measurements of the legs and add them, then take the square root of that.To find both legs of the triangle, you simply find the biggest angle. The vertex of that angle touched both the legs of the triangle.
Use Pythagoras' theorem if you know any two lengths of the triangle
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By using Pythagoras; theorem for a right angle triangle.