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