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Writing Proofs 2
A
B
C
Result
. . . .

Choose the conclusion(s) that may be deduced from the given information by using a definition, postulate, or theorem.

1. Points S and R
(a) Points S and R lie on a line.
(b) Points S and R lie on two different lines.
Both (a) and (b)
Neither (a) nor (b)
Answer: Points S and R lie on a line.
2. Noncollinear points A, B, and C
(a) Points A, B, and C lie on a line.
(b) Points A, B, and C lie on a plane.
Both (a) and (b)
Neither (a) nor (b)
Answer: Points A, B, and C lie on a plane.
3. mD=90
(a) Angle D is a right angle.
(b) Angle D is a complementary angle.
Both (a) and (b)
Neither (a) nor (b)
Answer: Angle D is a right angle.
4. AB ¯ CD ¯ and CD ¯ PQ ¯
(a) AB ¯ and PQ ¯ are complementary angles.
(b) AB ¯ and PQ ¯ are supplementary angles.
Both (a) and (b)
Neither (a) nor (b)
Answer: Neither (a) nor (b); a correct conclusion may be A B ¯ P Q ¯ .
5. mMNO+mONP=mMNP
(a) mMNO<mMNP
(b) mMNO =mMNPmONP
Both (a) and (b)
Neither (a) nor (b)
Answer: Both (a) and (b)
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