O-LevelMathematicsGeometry4024/11 · May/June 2011 · Q123 Marks
Show that the interior angle of a regular decagon is 144°.
- (a)Show that the interior angle of a regular decagon is 144°.[1]
- (b)AB and BC are two sides of a regular decagon. AB and BD are two sides of a regular hexagon. Work out the value of x. [Figure: Geometric diagram showing points A, B, C, D and angle x][2]
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