C Challenge

Algebra Find the value of x in the rhombus.

Standardized Test Prep

SAT/ACT

55. Which statement is true for some, but not all, rectangles?
    1. Opposite sides are parallel.
    2. It is a parallelogram.
    3. Adjacent sides are perpendicular.
    4. All sides are congruent.
56. A part of a design for a quilting pattern consists of a regular pentagon and five isosceles triangles, as shown. What is m ∠ 1 ? m angle 1 question mark

    

    6. 18
    7. 36
    8. 72
    9. 108
57. Which term best describes A D ¯ eh d bar in Δ A B C ? cap delta eh b c question mark

    

    1. altitude
    2. angle bisector
    3. median
    4. perpendicular bisector

Short Response

58. Write the first step of an indirect proof that Δ P Q R cap delta p q r is not a right triangle.

Mixed Review

See Lesson 6-3.

Can you conclude that the quadrilateral is a parallelogram? Explain.

See Lesson 5-1.

In Δ P Q R , cap delta p q r comma points S, T, and U are midpoints. Complete each statement.

62. T Q = _ ? t q equals , modified under bar with question mark above
63. P Q = _ ? p q equals , modified under bar with question mark above
64. T U = _ ? t u equals , modified under bar with question mark above
65. S U ¯ ∥ _ ? s u bar . parallel to , modified under bar with question mark above
66. T U ¯ ∥ _ ? t u bar . parallel to , modified under bar with question mark above
67. P Q ¯ ∥ _ ? p q bar . parallel to , modified under bar with question mark above

See Lesson 6-4.

Get Ready! To prepare for Lesson 6-5, do Exercises 68 and 69.

68. Draw a rhombus that is not a square.
69. Draw a rectangle that is not a square.

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