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Q1.

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Geometry
Found in: Page 130
Geometry

Geometry

Book edition Student Edition
Author(s) Ray C. Jurgensen, Richard G. Brown, John W. Jurgensen
Pages 227 pages
ISBN 9780395977279

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Illustration

Short Answer

Copy and complete the proof.

1. Given: PS; O is the midpoint of PS¯. Prove: is the midpoint of RQ¯

Proof

Statement

Reason

1. PS

Given

2. O is the midpoint of PS¯

Given

3. PO¯SO¯

As is the midpoint of and midpoint is a point on a line segment that divides it into two congruent line segments

4. POQSOR

Vertically Opposite angles

5. ΔPOQΔSOR

ASA congruence criteria

6. QO¯RO¯

Corresponding parts of congruent triangles are equal

7. O is the midpoint of RQ¯

As and midpoint is a point on a line segment that divides it into two congruent line segments

See the step by step solution

Step by Step Solution

Step 1 - Fill the blanks of first and second reason

Since, first and second statement of two column proof are given in the question. So, there reason must be “Given”.

Step 2 - Fill third blank

Since, midpoint is a point on a line segment that divides it into two congruent line segments

Thus, O divides line segment PS¯ in two congruent line segments

Hence, reason of third statement must be

“As O is the midpoint of PS¯ and midpoint is a point on a line segment that divides it into two congruent line segments”

Step 3 - Fill fourth blank

Observe from figure, POQ and SOR are vertically opposite angles and such angles are congruent

So reason for POQSOR will be “Vertically opposite angles”

Step 4 - Fill fifth blank

According to ASA congruence criteria, two triangles are said to be congruent if two angles and the included side of one triangle are congruent to the two angles and the included side of another triangle

Using statement 1, 3, and 4 ΔPOQΔSOR

So its reason will be “ASA Congruence Criteria”

Step 5 - Fill sixth blank

Since, corresponding parts of congruent triangles are equal

So, QO¯RO¯ because of same reason

Step 6 - Fill seventh blank

As QO¯RO¯ and midpoint is a point on a line segment that divides it into two congruent line segments

Thus, it the reason for the statement “O is the midpoint of RQ¯

Hence, complete proof will be

Statement

Reason

1. PS

Given

2. is the midpoint of PS¯

Given

3. PO¯SO¯

As O is the midpoint of PS¯ and midpoint is a point on a line segment that divides it into two congruent line segments

4. POQSOR

Vertically Opposite angles

5. ΔPOQΔSOR

ASA congruence criteria

6. QO¯RO¯

Corresponding parts of congruent triangles are equal

7. is the midpoint of

AsQO¯RO¯ and midpoint is a point on a line segment that divides it into two congruent line segments

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