180 x 2 = 360.
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There are 360 total degrees in a quadrilateral. A square has 4 90 degree angles, and 90x4=360. To explain further, a square with 4 right angles (or 90 degrees), will have 180 degrees when cut in half, so the full square is 180x2=360.
Circles measure 360 degreesAny quadrilateral as well.Try to picture this, if you take a rectangle, and make a diagonal line across it, you have two triangles. Triangles will ALWAYS measure up to 180 degrees, so since you have two, 180X2=360