Plane Figures

Plane Figures

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Pentagon

Formulas The formula to calculate the area A of a regular pentagon of side length c is: The formula to...

Relationship of Congruence

Examples Two figures congruent by a rotation: Two figures congruent by a translation: Two figures congruent by a reflection:

Sagitta

The line that contains the sagitta is the perpendicular bisector of the chord AB and passes through the centre O...
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