2D Shapes & Properties — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A triangle has 3 vertices.
A triangle has 3 vertices (corners), one at each point of the triangle.
2. A shape with 4 equal sides is a square.
A square has 4 equal sides and 4 equal corners — distinguishing it from a rectangle.
3. A pentagon has 5 sides.
A pentagon has 5 sides. Penta means five in Greek.
4. A circle has 0 vertices.
A circle has no vertices (corners) because it has no straight sides.
5. A hexagon has 6 sides.
A hexagon has 6 sides and 6 vertices. Hex means six.
6. A shape with 3 sides and 3 corners is a triangle.
A triangle is defined by having exactly 3 sides and 3 corners.
7. A rectangle has 4 vertices.
A rectangle has 4 vertices — one at each corner where two sides meet.
8. A shape with no sides and no corners is a circle.
Only a circle has no sides and no corners — it is perfectly round.
9. A square has 4 vertices.
A square has 4 vertices — one at each of the 4 corners.
Part B: Matching
Match each shape to its number of sides.
1.
triangle
→ 3
6
pentagon
→ 5
0
hexagon
→ 6
3
circle
→ 0
5
triangle→3, pentagon→5, hexagon→6, circle→0 sides.