Preparing for the Regents Examination Geometry, AK

19 Score Explanation
6 The following proof or another appropriate proof is given.
Statements Reasons
1. −−
AC −−
BD 1. Given.
2. −−
AC −−
BC −−
BD −−
BC 2. Subtraction postulate.
3. −−
AB −−−
CD 3. Partition postulate.
4. −−
GB −−−
AD ; −−
EC −−−
AD 4. Given.
5. GBA and ECD are right angles. 5. Definition of perpendicular lines.
6. GBA ECD 6. Right angles are congruent.
7. AGB DEC 7. Given.
8. AGB DEC 8. AAS AAS.
9. A D 9. CPCTC.
10. −−
AF −−
DF 10. Converse of isosceles triangle theorem.
5 An appropriate proof with correct conclusion is shown, but one reason is faulty and/or
one statement is missing.
4 A faulty conclusion or no conclusion is drawn from the statements and reasoning.
3 An appropriate proof with correct conclusion is shown, but three reasons are faulty or
three steps are missing.
2 An appropriate proof with correct conclusion is used, but more than three reasons are
faulty or more than three steps are missing or have errors.
1 −−
AF −−
DF and a reason is given, but no appropriate method is shown.
0 A zero response is completely incorrect, irrelevant, or incoherent or is a correct response
that was obtained by an obviously incorrect procedure.
Chapters 1–5 105