2D and 3D Shapes — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A pentagon has 5 sides.
A pentagon has 5 sides. The prefix 'penta' means five.
2. A hexagon has 6 vertices.
A hexagon has 6 vertices (corners), one at each point where two sides meet.
3. A quadrilateral has 4 sides.
A quadrilateral is any shape with exactly 4 sides. The prefix 'quad' means four.
4. The shape with the fewest sides is a triangle.
A triangle has 3 sides, which is the fewest sides any polygon can have.
5. A rectangle has 2 pairs of equal sides.
A rectangle has 2 pairs of equal sides — the top and bottom are equal, and the left and right are equal.
6. A shape with 8 sides is an octagon.
An octagon has 8 sides. The prefix 'oct' means eight, like an octopus has 8 arms.
7. A square has 4 right angles.
A square has 4 right angles, one at each corner. Each angle is exactly 90 degrees.
8. A shape with 6 equal sides is a hexagon.
A regular hexagon has 6 equal sides. The prefix 'hex' means six.
9. A rhombus has 4 sides.
A rhombus has 4 equal sides. It looks like a tilted square.
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
8
pentagon
→ 5
3
hexagon
→ 6
6
octagon
→ 8
5
Triangle has 3 sides, pentagon has 5 sides, hexagon has 6 sides, and octagon has 8 sides.