# Logic and reasoning

Here is a list of all of the skills that cover logic and reasoning! These skills are organized by grade, and you can move your mouse over any skill name to preview the skill. To start practicing, just click on any link. IXL will track your score, and the questions will automatically increase in difficulty as you improve!

## Geometry skills

- C.8 Proofs involving angles
- D.6 Proofs involving parallel lines I
- D.7 Proofs involving parallel lines II
- I.1 Identify hypotheses and conclusions
- I.2 Counterexamples
- I.3 Conditionals
- I.4 Negations
- I.5 Converses, inverses, and contrapositives
- I.6 Biconditionals
- I.7 Truth tables
- I.8 Truth values
- K.2 Proving triangles congruent by SSS and SAS
- K.4 Proving triangles congruent by ASA and AAS
- K.7 Proving triangles congruent by SSS, SAS, ASA, and AAS
- K.8 Proofs involving corresponding parts of congruent triangles
- K.10 Proofs involving isosceles triangles
- M.8 Proofs involving triangles I
- M.9 Proofs involving triangles II
- N.11 Proofs involving quadrilaterals I
- N.12 Proofs involving quadrilaterals II