180
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That's a triangle in which all three sides have three different lengths.
-- Make sure you have the lengths of all three sides -- Add up the lengths of all three sides to get the perimeter of the triangle.
-- Every triangle, no matter what its shape or size, has three angles inside it that add up to 180 degrees. -- Whyen you say "regular right angled triangle", I hope you don't mean that all three of its sides are the same length ... that's what "regular" usually means in geometry. It's impossible for a right triangle to have all of its sides equal.
130 in2 on all three sides if you add them all together....
All Triangles add up to 180 degrees, no matter if it is Right or Scalene or ANY TRIANGLE!! If it does not, it is not a triangle!