5. Use physical models to determine the sum of the interior angles of triangles and quadrilaterals.
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The sum of the interior angles of a triangle are always 180°, regardless of what type of triangle it is! The sum of the interior angles of a quadrangle (quadrilateral) are always 360°, regardless of what type of quadrangle it is.
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7. Understand that the measure of an angle is determined by the degree of rotation of an angle side rather than the length of either side.
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