Geometric terms and notation · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Naming points, lines, and angles

Mathematics · Geometry · ages 11-13
Name ______________________   Date ____________

  1. A regular hexagon has six sides. How many lines of reflective symmetry does it have?

    Answer: ______________

  2. Segment AB carries two small ticks, and segment CD carries the same two ticks. What does that tell you?

    • AB and CD are parallel
    • AB is longer than CD
    • AB and CD are equal in length
    • The ticks mean right angles

  3. What does the notation AB stand for?

    • The line segment from point A to point B
    • The angle at point A
    • The area between points A and B

  4. The symbol ∥ means two lines are perpendicular.

    Circle one:   True   False

  5. A regular hexagon turns onto itself every 60 degrees. How many such turns fit in a full circle of 360 degrees?

    Answer: ______________

  6. What is the order of rotational symmetry of a regular hexagon (how many positions in one full turn look identical to the start)?

    Answer: ______________

  7. Angle ABC is written down. Which letter holds the vertex?

    • B
    • A
    • C
    • It has no vertex

  8. Sam says angle ABC has its vertex at B because the middle letter names the corner. Is Sam right?

    Circle one:   True   False

  9. Ravi marks a right angle in his sketch with a curved arc, the same mark he uses for other angles. What should he use instead?

    • A curved arc with a number written inside
    • A small square in the corner
    • The ∥ symbol

  10. AB is parallel to CD, and CD is perpendicular to EF. What is AB to EF?

    • Parallel
    • Perpendicular
    • Equal in length
    • Cannot tell
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Answer key

For grown-ups. Fold this page away before handing over the rest.

Naming points, lines, and angles W1-mt_WtIFJSCQIT-s1

  1. 6 · Six sides give six mirror lines: three through opposite corners, three through opposite edges.
  2. AB and CD are equal in length · Matching tick marks promise equal length: AB equals CD.
  3. The line segment from point A to point B · AB names a straight line segment connecting the two points A and B.
  4. False · ∥ means parallel. Perpendicular lines use the symbol ⊥.
  5. 6 · 360 / 60 = 6 turns: the hexagon's rotational order is 6.
  6. 6 · Turning a regular hexagon matches its start position 6 times in one full turn, so its order of rotational symmetry is 6.
  7. B · The middle letter names the corner: B.
  8. True · Sam is right: middle-letter vertex is the naming rule.
  9. A small square in the corner · A small square marks a right angle specifically, so it stands out from the curved arcs used for other angles.
  10. Perpendicular · AB copies CD's direction, so it meets EF squarely too: perpendicular.
Worksheet · LightMySky