No, the interior angles of a triangle sum to 180o
The interior angles of a quadrilateral sum to 360o.
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Interior angles add up to 180 degrees Exterior angles add up to 360 degrees
Interior angles are 180 degrees Exterior angles are 360 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.
A square always has a sum of 360 degrees for the interior angles.
A twenty-sided polygon is called an "icosagon" If it is a regular icosagon - all its sides and angles are equal - then it's interior angles are all 162 degrees. You can verify this by drawing a line to the centre from each angle.. There will be 20 small angles arranged in a circle around the centre. These must total 360 degrees. As 360 / 20 = 18, this leaves the other angles of each triangle to add up to 162, because the interior angles of a triangle total 180 degrees.