Pearson Geometry Common Core, 2011
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Pearson Geometry Common Core, 2011 View details
1. Experimental and Theoretical Probability
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Exercise 34 Page 829

Recall the diagram that illustrates the relations between each of the types of quadrilaterals.

D

Practice makes perfect

We want to decide which statement about quadrilaterals is not true.

Statement True or False?
All squares are also rhombuses, rectangles, and parallelograms. ?
A parallelogram with at least 2 right angles is a rectangle. ?
A kite has two pairs of consecutive sides that are congruent. ?
A rhombus has exactly two equal sides. ?

There are 7 types of quadrilaterals. The diagram illustrates each of the types of quadrilaterals and their relationships to one another.

types of quadrilaterals

Each of the quadrilaterals has its own unique characteristics.

  1. Trapezoid — a quadrilateral with exactly one pair of parallel sides (Exclusive definition of trapezoid).
  2. Isosceles Trapezoid — a particular type of trapezoid whose legs are congruent.
  3. Kite — a quadrilateral with two pairs of congruent consecutive sides, where opposite sides are not congruent.
  4. Parallelogram — a quadrilateral with two pairs of parallel sides.
  5. Rhombus — a type of parallelogram that has four equal side lengths.
  6. Rectangle — a type of parallelogram that has four right angles.
  7. Square — a type of rectangle that has four equal side lengths.

Looking at the diagram, we can already tell that the first statement is true. Squares are rhombuses because they have four equal sides, and they are also rectangles because they have four right angles. This indicates that they can also be called parallelograms.

Statement True or False?
All squares are also rhombuses, rectangles, and parallelograms. True
A parallelogram with at least 2 right angles is a rectangle. ?
A kite has two pairs of consecutive sides that are congruent. ?
A rhombus has exactly two equal sides. ?

Now, let's recall that in a parallelogram, opposite angles are congruent and consecutive angles are supplementary. This means that if a parallelogram has 2 right angles, then the other two angles also need to be right. Therefore, a parallelogram with at least 2 right angles must be a rectangle, so the second statement is also true.

Statement True or False?
All squares are also rhombuses, rectangles, and parallelograms. True
A parallelogram with at least 2 right angles is a rectangle. True
A kite has two pairs of consecutive sides that are congruent. ?
A rhombus has exactly two equal sides. ?

Next, the definition of a kite tells us that it is a quadrilateral with 2 pairs of congruent consecutive sides. This means the third statement is again true.

Statement True or False?
All squares are also rhombuses, rectangles, and parallelograms. True
A parallelogram with at least 2 right angles is a rectangle. True
A kite has two pairs of consecutive sides that are congruent. True
A rhombus has exactly two equal sides. ?

Finally, the fourth statement is false because a rhombus is a type of parallelogram that has 4 — not 2 — equal side lengths.

Statement True or False?
All squares are also rhombuses , rectangles, and parallelograms. True
A parallelogram with at least 2 right angles is a rectangle. True
A kite has two pairs of consecutive sides that are congruent. True
A rhombus has exactly two equal sides. False

Therefore, only statement D is not true.