Inductive reasoning is when you start with some specific facts and make a general guess. Deductive reasoning is when you start with general ideas and make a specific guess. If the starting facts in deductive reasoning are true, then the guess you make will always be right.
Deductive and inductive reasoning
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Direct and indirect proof
Parallel lines and planes
Congruence and similarity
Polygons
Right triangles
Circles
Coordinate geometry
Transformations and symmetry
Constructions and Loci
Perimeter, area, and volume