Lines, Rays & Angles · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Points, Lines, Segments, and Rays

Mathematics · Geometry · ages 9-10
Name ______________________   Date ____________

  1. How many arrows does a ray have in a drawing?

    • 0
    • 1
    • 2

  2. A door starts closed. It opens a small amount. The amount it has turned from closed is a positive opening smaller than the right angle of a rectangular book corner. What type of angle is that opening?

    • A right angle
    • An acute angle
    • An obtuse angle
    • A straight angle

  3. A drawing shows a pair of parallel lines on squared paper. Each line has an arrowhead on both ends. How many arrowheads are drawn in all?

    Answer: ______________

  4. Which one has two endpoints and does not go on forever?

    • Line segment
    • Line
    • Ray

  5. A closed four-sided shape has a top side along one grid row and a bottom side along another grid row. The left and right sides slant in different directions and are not parallel. Which pair of sides is parallel?

    • The top and bottom sides
    • The left and right sides
    • All four sides
    • No sides

  6. Which angle is wider than a right angle but less than a half turn?

    • Acute angle
    • Obtuse angle
    • Right angle

  7. Each perpendicular crossing makes 4 right angles. A student draws 2 separate perpendicular crossings in one figure. How many right angles are drawn?

    Answer: ______________

  8. A trapezoid has one pair of sides that never meet, no matter how far they stretch. What do we call those sides?

    • Parallel
    • Perpendicular
    • Equal

  9. Mia draws a shape with 4 sides. Two sides are parallel, but the other two sides slant toward each other and are not parallel. What shape is she describing?

    • Square
    • Rectangle
    • Trapezoid

  10. A figure has 5 separate angles drawn in a row: 2 right angles, 2 acute angles, and 1 obtuse angle. How many of the angles are less than a right angle?

    Answer: ______________

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Answer key

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

Points, Lines, Segments, and Rays W1-mt_QysgF57dxh-s1

  1. 1 · A ray has one arrow, showing it goes on forever in just one direction from its starting point.
  2. An acute angle · A positive opening smaller than a right angle is acute.
  3. 4 · Each of the 2 parallel lines has 2 arrowheads, so 2 + 2 = 4.
  4. Line segment · A line segment stops at both ends. A line and a ray keep going forever in at least one direction.
  5. The top and bottom sides · The top and bottom sides follow grid rows, which have the same direction, so they are parallel. The left and right sides slant in different directions and are not parallel.
  6. Obtuse angle · An obtuse angle is greater than a right angle and less than a half turn.
  7. 8 · Each crossing makes 4 right angles, so 2 crossings make 4 + 4 = 8.
  8. Parallel · Sides that never meet, even stretched forever, are called parallel sides.
  9. Trapezoid · Under this lesson's exactly-one-pair convention, a trapezoid has exactly one pair of parallel sides. Mia's shape has exactly one pair, so it is a trapezoid. A square and a rectangle have two pairs.
  10. 2 · Right angles are exactly a right angle, not less. Acute angles are less than a right angle. Obtuse is greater. So 2 angles are less.
Worksheet · LightMySky