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. In ∠XYZ, which point is the vertex, where the angle actually forms?

    • X
    • Y
    • Z

  2. What does the notation AB stand for?

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

  3. The symbol ∥ means two lines are perpendicular.

    Circle one:   True   False

  4. Two lines cross and form a perfect square corner. Which notation describes them?

    • AB ∥ CD
    • AB ⊥ CD
    • ∠ABC

  5. A regular hexagon has how many lines of reflective symmetry?

    • 3
    • 6
    • 12

  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. A figure shows AB ∥ CD, and AB meets line EF at a right angle. What must be true about CD and EF?

    • CD is also perpendicular to EF
    • CD is parallel to EF
    • Nothing can be determined

  8. 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 small square in the corner
    • A curved arc with a number written inside
    • The ∥ symbol
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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. Y · The middle letter in angle notation always names the vertex.
  2. The line segment from point A to point B · AB names a straight line segment connecting the two points A and B.
  3. False · ∥ means parallel. Perpendicular lines use the symbol ⊥.
  4. AB ⊥ CD · A square corner is a right angle, and lines meeting at a right angle are perpendicular, shown with ⊥.
  5. 6 · A regular hexagon has 6 equal sides, so it has 6 lines of reflective symmetry.
  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. CD is also perpendicular to EF · Since CD runs parallel to AB, and AB is perpendicular to EF, CD must also be perpendicular to EF.
  8. 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.
Worksheet · LightMySky