The 3 interior angles add up to 180 degrees
The 3 exterior angles add up to 360 degrees
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It's not. It's 180o.
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It is 1/2 of length x width
The sum of the interior angles of a triangle on a plane is always 180 degrees.
In a triangle, the sum of the angles is always 180 degrees. This is known as the angle sum property of triangles. Additionally, the largest angle in a triangle is always opposite the longest side, and the smallest angle is opposite the shortest side.