Chapter 4.3, Problem 25E

### Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

Chapter
Section

### Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085
Textbook Problem

# In Exercises 25 and 26, supply the missing statements and reasons. Given: Quadrilateral PQST with midpoints A, B, C, and D of the sides Prove: ABCD is a ▱ PROOF Statements Reasons 1. Quadrilateral PQST with midpoints A, B, C, and D of the sides 1. ? 2. Draw T Q ¯ 2. Through two points, there is one line 3. A B ¯ | | T Q ¯  in  △ T P Q 3. The line joining the midpoints of two sides of a triangle is | | to the third side 4. D C ¯ | | T Q ¯  in  △ T S Q 4. ? 5. A B ¯ | | D C ¯ 5. ? 6. Draw P S ¯ 6. ? 7. A D ¯ | | P S ¯  in  △ T S P 7. ? 8. B C ¯ | | P S ¯  in  △ P S Q 8. ? 9. A D ¯ | | B C ¯ 9. ? 10. ? 10. If both pairs of opposite sides of a quadrilateral are | | , the quadrilateral is a ▱

To determine

To supply:

The missing statements and reasons and prove ABCD is a .

Explanation

ASA Rule for triangle congruency:

Calculation:

The inner parallelogram creates four separate triangles. We must prove that the triangles opposite each other a congruent.

 PROOF Statements Reasons 1. Quadrilateral PQST with midpoints A, B, C, and D of the sides 1. Given 2. Draw TQÂ¯ 2. Through two points, there is one line 3. ABÂ¯||TQÂ¯Â inÂ â–³TPQ 3. The line joining the midpoints of two sides of a triangle is || to the third side 4. DCÂ¯||TQÂ¯Â inÂ â–³TSQ 4. The line joining the midpoints of two sides of a triangle is || to the third side. By ASA (Angle Side Angle), the opposite triangles are congruent. 5. ABÂ¯||DCÂ¯ 5

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