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- Name each definition cited and say whether it runs forward or backward.
- Decide whether Grace's 5 m and 12 m measurements give a right angle at the garden corner.
- Tell which conclusions are correctly drawn from the Pythagorean theorem and the parallel lines theorem.
- Write each converse, decide if it is true, and give a counterexample or a proof.
- Show a statement about the distance from the origin is true, then test its converse and a partial swap.
- Test both directions of each proposed definition and repair the ones that fail.
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Converses and biconditional definitions: the lesson ›More Chapter 1 worksheets: Points, lines, planes and the language of proof
- 1.1Axioms, definitions and theorems
- 1.2Points, lines and planes
- 1.3Lines and planes in space
- 1.4The midpoint formula
- 1.5Conjecture, and why a pattern is not a proof
- 1.6Counterexample
- 1.7Inductive reasoning
- 1.8Deductive reasoning
- 1.9Statements and negation
- 1.10Conditionals, converse, inverse, contrapositive
- 1.11Biconditional
- 1.12Converses and biconditional definitions