Angles

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Definiton and properties of a rectangle (coordinate geometry)

An animated demonstration showing how to use a protractor to measure an angle

How to draw an isosceles triangle given the base and altitude with compass and straightedge

How to draw an isosceles triangle with compass and straightedge

An animated demonstration showing how to use a protractor to draw an angle

How to copy a triangle with compass and straightedge

Congruent triangles - all three sides equal. SSS

Congruent triangles - Why SSA does not work

Congruent triangles - Two sides and included angle. SAS

Polygons are congruent when all corresponding sides and interior angles are congruent.

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