Attributes of Shapes — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A square has 4 lines of symmetry.
A square has 4 lines of symmetry: 2 through opposite corners and 2 through the midpoints of opposite sides.
2. A rectangle has 2 lines of symmetry.
A rectangle has 2 lines of symmetry, each passing through the midpoints of opposite sides.
3. An equilateral triangle has 3 lines of symmetry.
An equilateral triangle has 3 lines of symmetry, one from each vertex to the midpoint of the opposite side.
4. A shape with no lines of symmetry is called asymmetric.
A shape that cannot be divided into two equal mirror-image halves is called asymmetric.
5. A regular hexagon has 6 sides that are all equal.
A regular hexagon has 6 equal sides and 6 equal angles.
6. The corner where two sides of a polygon meet is called a vertex.
A vertex is the point where two sides of a polygon meet. The plural form is vertices.
7. A closed flat shape made of straight sides is a polygon.
A polygon is a closed, flat shape made up of straight line segments.
8. A parallelogram has opposite sides that are parallel.
In a parallelogram, opposite sides are parallel, meaning they run in the same direction and never meet.
9. A regular polygon has all sides and all angles equal.
A regular polygon has all sides the same length and all angles the same measure.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Triangle
→ 3 sides
8 sides
Hexagon
→ 6 sides
5 sides
Pentagon
→ 5 sides
3 sides
Octagon
→ 8 sides
6 sides
A triangle has 3 sides. A hexagon has 6 sides. A pentagon has 5 sides. An octagon has 8 sides.