2D and 3D Shapes — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which shape has exactly 5 sides?
A) hexagon
B) pentagon
C) octagon
D) quadrilateral
A pentagon has exactly 5 sides. The prefix 'penta' means five.
2. A cube has how many faces?
A) 4
B) 6
C) 8
D) 12
A cube has 6 square faces — top, bottom, front, back, left, and right.
3. Which 2D shape has all sides equal AND all right angles?
A) rectangle
B) rhombus
C) square
D) triangle
A square has 4 equal sides and 4 right angles. A rectangle has right angles but not necessarily equal sides.
4. How many edges does a rectangular prism have?
A) 6
B) 8
C) 10
D) 12
A rectangular prism has 12 edges — 4 on top, 4 on the bottom, and 4 vertical edges connecting them.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A triangle has 3 sides and 3 vertices.
A triangle has 3 sides and 3 vertices. The prefix 'tri' means three.
2. A shape with no corners and no edges is a sphere.
A sphere has no corners (vertices) and no edges because it is perfectly round.
3. A hexagon has 6 sides.
A hexagon has 6 sides. The prefix 'hex' means six.
4. A cone has 1 flat face and 1 curved surface.
A cone has 1 flat circular face at the base and 1 curved surface that comes to a point.
5. A cylinder has 0 vertices.
A cylinder has 0 vertices because its edges are curved circles, not points.