Parallel and Intersecting Lines | IT

Question 8

Are line segments OP\text{OP} and QR\text{QR} likely to meet if they are extended?

Question diagram 1
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Solution
Understand the Question
  • Parallel lines are straight lines that lie in the same plane and remain at a constant perpendicular distance from each other at all points.
  • Because their distance never changes, parallel lines never intersect or cross, no matter how far they are extended in either direction.
  • To determine if line segments OP\text{OP} and QR\text{QR} will meet, we examine whether they are parallel.

Step 1 · Analyze the Line Segments

From the given figure, line segments OP\text{OP} and QR\text{QR} run in the same direction and maintain a constant distance between them, which indicates they are parallel lines.Diagram 1

By definition, parallel lines never meet or intersect, no matter how far they are extended indefinitely in either direction.

Therefore, line segments OP\text{OP} and QR\text{QR} will not meet.

Answer

No, line segments OP\text{OP} and QR\text{QR} are not likely to meet if they are extended.

Common Mistakes
  • Assuming Non-Intersecting Means Parallel in Any Orientation: Lines only avoid intersecting if they are strictly parallel (maintaining constant distance). If lines are slightly tilted toward each other, extending them will eventually cause them to cross.
  • Terminating Line Segments: Forgetting that line segments can be extended infinitely as lines, and judging intersection only based on their current drawn lengths.

More questions in IT

Q1

Context: Let us observe what happens when two lines intersect.

Q. How many angles do they form?

Q2

Can two straight lines intersect at more than one point?

Q3

In Fig. 5.2, if a\angle a is 120120^\circ, can you figure out the measurements of b\angle b, c\angle c and d\angle d, without drawing and measuring them?

Q4

Context: When two lines intersect each other and form four angles, labelled aa, bb, cc and dd, then a\angle a and c\angle c are equal, and b\angle b and d\angle d are equal.

Q. Is this always true for any pair of intersecting lines?

Q5

Can you draw a pair of intersecting lines such that all four angles are equal? Can you figure out what will be the measure of each angle?

Q6

Observe Fig. 5.5 and describe the way the line segments meet or cross each other in each case, with appropriate mathematical words (a point, an endpoint, the midpoint, meet, intersect) and the degree measure of each angle.

Q7

Are line segments ST\text{ST} and UV\text{UV} likely to meet if they are extended?

Q8

Are line segments OP\text{OP} and QR\text{QR} likely to meet if they are extended?

Q9

Name some parallel lines you can spot in your classroom.

Q10

Which pairs of lines appear to be parallel in Fig. 5.6 below?

Q11

Is it possible for all the eight angles to have different measurements? Why, why not?

Q12

What about five different angles — 6, 5, 4, 3 and 2?

Q13

Suppose, we have a transversal intersecting two parallel lines. What can be said about the corresponding angles?

Q14

Context: Activity 5 In Fig. 5.20, draw a transversal tt to the lines ll and mm such that one pair of corresponding angles is equal. You can measure the angles with a protractor.

Q. Are you finding it hard to draw a transversal such that the corresponding angles are equal?

Q15

Draw two more parallel lines using the long side of the set square as shown in Fig. 5.22. How do you know these two lines are parallel? Can you check if the corresponding angles are equal?

Q17

Why are lines ll and mm parallel to each other?

Q18

Is there a relation between 3\angle 3 and 6\angle 6? You could try to find the relationship by taking different values for 3\angle 3 and see what 6\angle 6 is. Once you find a relation, try to justify it or prove that this relation holds always.

Q19

There do not seem to be any parallel lines here. Or, are there?

What causes these illusions?

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