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Which of the following best describes the quadrilaterals shown below?

A. Quadrilateral 1 and quadrilateral 2 are congruent because quadrilateral 2 can be created by rotating and then translating quadrilateral 1.


B. Quadrilateral 1 and quadrilateral 2 are congruent because quadrilateral 2 can be created by rotating and then dilating quadrilateral 1.


C. Quadrilateral 1 and quadrilateral 2 are similar because quadrilateral 2 can be created by dilating and then translating quadrilateral 1.


D. Quadrilateral 1 and quadrilateral 2 are similar because quadrilateral 2 can be created by rotating and then dilating quadrilateral 1.

Which of the following best describes the quadrilaterals shown below? A. Quadrilateral-example-1

2 Answers

2 votes

Answer: The correct option is

(A) Quadrilateral 1 and quadrilateral 2 are congruent because quadrilateral 2 can be created by rotating and then translating quadrilateral 1.

Step-by-step explanation: We are given to select the statement that best describes the quadrilaterals shown in the figure.

From the graph, we note that

the co-ordinates of the vertices of quadrilateral 1 are (3, -2), (1, -3), (2, -7) and (6, -5).

And, the co-ordinates of the vertices of quadrilateral 2 are (-3, 2), (-4, 4), (-8, 3) and (-6, -1).

We see that if quadrilateral 1 is rotated 90° clockwise and then translated 5 units upwards, 1 unit left, then its vertices changes according to the following rule :

(x, y) ⇒ (y, -x) ⇒ (y-1, -x+5).

That is,

(3, -2) ⇒ (-2, -3) ⇒ (-2-1, -3+5) = (-3, 2),

(1, -3) ⇒ (-3, -1) ⇒ (-3-1, -1+5) = (-4, 4),

(2, -7) ⇒ (-7, -2) ⇒ (-7-1, -2+5) = (-8, 3),

(6, -5) ⇒ (-5, -6) ⇒ (-5-1, -6+5) = (-6, -1).

Therefore, the co-ordinates of the vertices of quadrilateral 2 can be obtained from the co-ordinates of the vertices of quadrilateral 1 by applying the following two transformations :

rotation of 90° clockwise and then translation 5 units upwards, 1 unit to the left.

Since rotation and translation does not change the size of the quadrilateral, so quadrilaterals 1 and 2 are congruent.

Thus, quadrilateral 1 and quadrilateral 2 are congruent because quadrilateral 2 can be created by rotating and then translating quadrilateral 1.

Option (A) is CORRECT.

User Eglobetrotter
by
5.7k points
3 votes

Answer:

A. Quadrilateral 1 and quadrilateral 2 are congruent because quadrilateral 2 can be created by rotating and then translating quadrilateral 1.

Explanation:

Both have the same dimensions, so there has been no dilation. The only answer choice describing a rigid transformation is choice A.

User Sheren
by
6.1k points