**Using properties of parallel lines worksheet :**

Worksheet given in this section is much useful to the students who would like to practice problems on properties of parallel lines.

**Problem 1 : **

In the diagram given below, lines m, n and k represent three of the oars. If m||n and n||k, then prove m||k.

**Problem 2 :**

In the diagram given below, if ∠1 ≅ ∠2, then prove m||n.

**Problem 3 :**

In the diagram given below, each line is parallel to the next immediate line. Explain why the line K_{1} is parallel to the line K_{2}.

**Problem 4 :**

In the diagram given below, lines a and b are perpendicular to the line c. Prove that the lines a and b are parallel.

**Problem 5 :**

In the diagram given below, if ∠4 and ∠5 are supplementary, then prove g||h.

**Problem 6 :**

In the diagram given below, find the value of x that makes j||k.

**Problem 7 :**

If two boats sail at a 45° angle to the wind as shown, and the wind is constant, will their paths ever cross ? Explain.

**Problem 8 : **

In the diagram given below, decide which rays are parallel.

(i) Is EB parallel to HD ?

(ii) Is EA parallel to HC ?

**Problem 1 : **

In the diagram given below, lines m, n and k represent three of the oars. If m||n and n||k, then prove m||k.

**Solution :**

m||n ∠1 ≅ ∠2 n||k ∠2 ≅ ∠3 ∠1 ≅ ∠3 m||k |
Given Corresponding angles postulate Given Corresponding angles postulate Transitive property of congruence Corresponding angle converse |

**Problem 2 :**

In the diagram given below, if ∠1 ≅ ∠2, then prove m||n.

**Solution :**

∠1 ≅ ∠2 ∠2 ≅ ∠3 ∠1 ≅ ∠3 m||n |
Given Vertical angles theorem Transitive property of congruence Corresponding angles converse |

**Problem 3 :**

In the diagram given below, each line is parallel to the next immediate line. Explain why the line K_{1} is parallel to the line K_{2}.

**Solution : **

We are given that K_{1}||K_{2 }and K_{2}||K_{3. }

By transitive property of parallel lines, K_{1}||K_{3. }

Since K_{1}||K_{3 }and K_{3}||K_{4}, again by transitive property, it follows that K_{1}||K_{4. }

**Problem 4 :**

In the diagram given below, lines a and b are perpendicular to the line c. Prove that the lines a and b are parallel.

**Solution : **

Since the line c cuts both the lines a and b, the line c is transversal. Both the lines a and b are perpendicular to the line c. So, the measure of both ∠1 and ∠2 in the above diagram is 90° and c is transversal to the lines a and b.

That is,

m∠1 = 90°

m∠2 = 90°

By corresponding angles converse, the lines a and b are parallel.

**Problem 5 :**

In the diagram given below, if ∠4 and ∠5 are supplementary, then prove g||h.

**Solution : **

We are given that ∠4 and ∠5 are supplementary. By the linear pair postulate, ∠5 and ∠6 are also supplementary, because they form a linear pair. By the congruence supplements theorem, it follows that ∠4 ≅ ∠6. Therefore, by the alternate interior angles converse, g and h are parallel.

**Problem 6 :**

In the diagram given below, find the value of x that makes j||k.

**Solution : **

Lines j and k will be parallel if the marked angles are supplementary.

x° + 4x° = 180°

5x = 180

x = 36

So, x = 36 makes j||k.

**Problem 7 :**

If two boats sail at a 45° angle to the wind as shown, and the wind is constant, will their paths ever cross ? Explain.

**Solution :**

Because corresponding angles are congruent, the paths of the boats are parallel. Parallel lines do not intersect. So the paths of the boats will never cross.

**Problem 8 : **

In the diagram given below, decide which rays are parallel.

(i) Is EB parallel to HD ?

(ii) Is EA parallel to HC ?

**Solution (i) : **

m∠BEH = 58°

m∠DHG = 61°

∠BEH and ∠DHG are corresponding angles, but they are not congruent. So EB and HD are not parallel.

**Solution (ii) : **

m∠AEH = 62° + 58° = **120****°**

m∠CHG = 59° + 61° = **120****°**

∠AEH and ∠CHG are congruent corresponding angles. So AE and CH are parallel.

After having gone through the stuff given above, we hope that the students would have understood "Using properties of parallel lines worksheet".

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