Image caption, Line segments AB and GH are the same ... The sizes of angles must be equal between the two shapes. It is possible to calculate missing lengths on similar shapes when given either ...
\(e = c\) (alternate angles are equal) \(a + d + e = 180^\circ\) (angles on a straight line add up to 180°) So \(a + b + c = 180^\circ\). These facts can be used to calculate angles.
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