Interior angles in a triangle add up to 180°. Interior angles in a quadrilateral add up to 360°. Symmetry and 2D shapes Parts of a shape on either side of a line of symmetry will be exact mirror ...
As the point P moves anticlockwise around the circle from 0°, the angle \(\theta\) changes ... There is a line of symmetry at \(x = 90^\circ\), so there is a solution at \(180 - 30 = 150 ...
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