A triangle is a 3 sided polygon that has 3 interior angles that add up to 180 degrees
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Yes, and it is a triangle with one 90-degree angle and two acute angles.
A triangle has 3 sides. A regular triangle has all EQUAL sides. An isosceles triangle has 2 EQUAL sides. A scalene triangle has NO equal sides. Equal = parallel..basically equal and parallel are the same thing, in this conversation.
Oh honey, the "horizontal" of a triangle is not a thing. Maybe you meant the base? That's the bottom side of a triangle, just like how the top side is called the "altitude." But hey, we all have our brain farts sometimes, so no judgment here!
i dont have a thing.
If a triangle is obtuse, the orthocenter of the triangle actually lies outside of the triangle. If the triangle is acute, the orthocenter of the triangle lies on the inside of the triangle