Take any two quadrilaterals, say ABCD. Divide it into two triangles, by drawing a diagonal. You get six angles 1, 2, 3, 4, 5 and 6. Use the angle sum property of a triangle and argue how the sum of measures of angle A, angle B, angle C, and angle D amounts to 180° + 180° = 360°
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the sum of all interior angles of a quadrilateral is equal to 360°
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