2D Shapes & Properties — 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 — horizontal, vertical, and two diagonal lines.
2. A rectangle has 2 lines of symmetry.
A rectangle has 2 lines of symmetry — one horizontal and one vertical.
3. Two triangles can make a square.
Two right triangles placed together along their hypotenuse can form a square.
4. A shape with 6 sides is called a hexagon.
A hexagon has 6 sides. The prefix hex- means six.
5. A circle has many lines of symmetry.
A circle has infinitely many lines of symmetry — any line through the center is a line of symmetry.
6. A rectangle has 4 sides but they are not all equal.
A rectangle has 4 sides, but unlike a square, the sides are in two pairs of equal lengths.
7. Two squares side by side can make a rectangle.
Two equal squares placed side by side form a rectangle that is twice as long as it is wide.
8. A pentagon has 5 vertices.
A pentagon has 5 vertices (corners) and 5 sides.
9. A hexagon has 6 vertices.
A hexagon has 6 vertices — one at each corner where sides meet.
Part B: Matching
Match each shape to the correct description.
1.
square
→ 4 equal sides
3 sides, 3 corners
triangle
→ 3 sides, 3 corners
6 sides, 6 corners
rectangle
→ 2 long sides, 2 short sides
4 equal sides
hexagon
→ 6 sides, 6 corners
2 long sides, 2 short sides
square→4 equal sides, triangle→3 sides/3 corners, rectangle→2 long/2 short sides, hexagon→6 sides/6 corners.