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Q: What is the sum of internal angles of a triangle?

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180 degrees

The sum of the internal angles of any triangle is 180 degrees. Any rectangle has four 90 degree internal angles, totalling 360 degrees.

The internal angles add to 180 degrees.

Any quadrilateral may be split into two triangles; the sum of internal angles of any triangle is 180 degrees; so the sum of internal angles of a quadrilateral will then be the double of the sum of internal angles of a triangle: 180 x 2 = 360.

the sum of the internal angles of a triangle, no matter whether isosceles, equilateral or scalene, is always 180 degrees

The 3 inside angles of any triangle add up to 180 degrees

The sum of the interior angles of a triangle is always equal to 180o.

The sum of the three angles of any triangle is 180o.

The sum of the angles in any triangle is 180 degrees.

Sum of interior angles of a triangle total 180 degrees

The third angle is 85 degrees. The sum of all internal angles in a triangle is always 180 degrees

There is no proof - diagrammatical or otherwise - since it is not true. The sum of the internal angles of a hexagon, for example, is 720 degrees, while for a triangle the sum is 180 degrees - not half of 720.

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