Lines

8 Grade 6 Mathematics questions on Lines, with worked marking schemes. 8 questions are available on this topic in full.

1. Question 1

   1 mark

   How many lines of symmetry does an equilateral triangle have?

   A. 2

   B. 1

   C. 6

   D. 3

   (1 mark)

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2. Question 2

   1 mark

   How many lines of symmetry does a square have?

   A. 2

   B. 8

   C. 1

   D. 4

   (1 mark)

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3. Question 3

   1 mark

   Lines that will never meet however far they are extended are called:

   A. Skew lines

   B. Parallel lines

   C. Perpendicular lines

   D. Intersecting lines

   (1 mark)

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4. Question 4

   1 mark

   A line segment has:

   A. One endpoint

   B. Two endpoints

   C. No endpoints

   D. Infinite length

   (1 mark)

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5. Question 5

   1 mark

   Two straight lines cross each other. What are the vertically opposite angles?

   A. Supplementary

   B. Equal

   C. Right angles

   D. Complementary

   (1 mark)

   Marking scheme

   B. Equal — vertically opposite angles sit across the crossing point from one another and are always equal. Adjacent angles at the crossing are the supplementary pair.

6. Question 6

   1 mark

   A transversal cuts two parallel lines. Alternate angles are:

   A. Right angles

   B. Complementary

   C. Equal

   D. Supplementary

   (1 mark)

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7. Question 7

   1 mark

   Co-interior angles formed when a transversal cuts parallel lines add up to:

   A. 180°

   B. 270°

   C. 90°

   D. 360°

   (1 mark)

   Marking scheme

   A. $180^{\circ }$ — co-interior angles lie inside the parallel lines on the same side of the transversal and are supplementary. The alternate and corresponding pairs are the equal ones.

8. Question 8

   1 mark

   Which of these is a pair of perpendicular lines?

   A. Lines meeting at 90°

   B. Lines that never meet

   C. Curved lines

   D. Lines meeting at 45°

   (1 mark)

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