It is the sum of all three sides. If you are only given 2 sides, you may need to use pythagoras' theorem, and if you are given an angle and a side you may need to use trigonometry.
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Yes. But not the other way round. If all three angles are equal (equiangular) then two of them must be equal (isosceles).
The outside of the circle is always the same distance from the centre. The outside of an ellipse is not the same distance from the centre all the way round.
a perimiter is always the distance all the way round. So it will be 6+ 8+10 but do it in stages 6+8=14 now add the last piece 14+10=24 (6+8+10=24) it does not matter if it is feet or miles or mm. Think of walking round the triangle. Hope that helps.
If it has 2 equal acute angles and 1 obtuse angle then it is an isosceles triangle.
They all have 3 sides and they all measure 180 Degrees