Examples with solutions for Identifying a Parallelogram: Identification by diagonals

Exercise #1

Below is the quadrilateral ABCD.

AF = 4 and FD = 6.

BF = 2 and FC = 3.

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Is the quadrilateral a parallelogram?

Video Solution

Step-by-Step Solution

To determine whether quadrilateral ABCD is a parallelogram, we examine the segments of its diagonals.

  • Measure segments AFAF and FDFD on diagonal ADAD.
  • Measure segments BFBF and FCFC on diagonal BCBC.

We have:

  • AF=4AF = 4 and FD=6FD = 6.
  • BF=2BF = 2 and FC=3FC = 3.

A necessary condition for ABCD to be a parallelogram is that its diagonals bisect each other:

  • This requires AF=FDAF = FD and BF=FCBF = FC.

Here, AFAF is not equal to FDFD and BFBF is not equal to FCFC, which means the diagonals do not bisect each other.

Therefore, quadrilateral ABCD is not a parallelogram.

The correct answer is No.

Answer

No

Exercise #2

Look at the quadrilateral ABCD shown below.

AF = 2 and FD = 2.

BF = 5 and FC = 5.

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Is this quadrilateral a parallelogram?

Video Solution

Step-by-Step Solution

To determine if quadrilateral ABCDABCD is a parallelogram, we need to verify if its diagonals ACAC and BDBD bisect each other. This can be confirmed if their respective segments around intersection point FF are equal.

Given the information, we have:

  • AF=2AF = 2 and FD=2FD = 2, indicating diagonal ADAD is bisected by FF.
  • BF=5BF = 5 and FC=5FC = 5, indicating diagonal BCBC is bisected by FF.

Since both conditions are satisfied, the diagonals indeed bisect each other, fulfilling the criteria for quadrilateral ABCDABCD to be a parallelogram.

Therefore, the answer to the question is Yes, quadrilateral ABCDABCD is a parallelogram.

Answer

Yes.

Exercise #3

Shown below is the quadrilateral ABCD.

AF = 5 and FD = 6.

BF = 7 and FC = 7.

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Is the quadrilateral a parallelogram?

Video Solution

Step-by-Step Solution

To determine if the quadrilateral ABCD is a parallelogram, we must consider the properties of its diagonals. One key property of parallelograms is that the diagonals bisect each other.

We are given AF=5 AF = 5 , FD=6 FD = 6 , BF=7 BF = 7 , and FC=7 FC = 7 . These segments imply the diagonals intersect at point F. To be a parallelogram, each pair of opposite triangle segments created should be equal.

Checking for bisected diagonals:
- For diagonal AC AC , segments AF=5 AF = 5 and FC=7 FC = 7 are not equal.
- For diagonal BD BD , segments BF=7 BF = 7 and FD=6 FD = 6 are also not equal.

Since neither diagonal is divided into equal lengths by point F, diagonals AC and BD do not bisect each other.

Therefore, quadrilateral ABCD does not meet the condition of diagonals bisecting one another and cannot be classified as a parallelogram.

No.

Answer

No.

Exercise #4

Below is the quadrilateral ABCD.

AF = 2 and FD = 3.

BF = 5 and FC = 4.

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Is the quadrilateral a parallelogram?

Video Solution

Answer

No.

Exercise #5

Below is the quadrilateral ABCD.

AF = 4 and FD = 6.

BF = 8 and FC = 5.

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Is the quadrilateral a parallelogram?

Video Solution

Answer

No.

Exercise #6

Shown below is the quadrilateral ABCD.

AF = 4 and FD = 6.

BF = 8 and FC = 6.

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Is the quadrilateral a parallelogram?

Video Solution

Answer

No.

Exercise #7

Below is the quadrilateral ABCD.

AF = 8 and FD = 8.

BF = 10 and FC = 10.

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Is the quadrilateral a parallelogram?

Video Solution

Answer

Yes.

Exercise #8

Shown below is the quadrilateral ABCD.

AF = 4 and FD = 4.

BF = 9 and FC = 9.

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Is the quadrilateral a parallelogram?

Video Solution

Answer

Yes.

Exercise #9

Look at the quadrilateral ABCD.

AF = 4

FD = 6

BF = 5

FC = 5

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Is this quadrilateral a parallelogram?

Video Solution

Answer

No

Exercise #10

Look at the quadrilateral ABCD.

AF = 4

FD = 4

BF = 5

FC = 5

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Is this quadrilateral a parallelogram?

Video Solution

Answer

Yes

Exercise #11

Shown below is the quadrilateral ABCD.

AF = 5 and FD = 5.

BF = 8 and FC = 8.

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Is the quadrilateral a parallelogram?

Video Solution

Answer

Yes

Exercise #12

The quadrilateral ABCD is shown below.

AF = 10 and FD = 10.

BF = 5 and FC = 5.

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Is the quadrilateral a parallelogram?

Video Solution

Answer

Yes