2D and 3D Shapes — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. How many edges does a cube have?
A) 6
B) 8
C) 10
D) 12
A cube has 4 edges around the top, 4 around the bottom, and 4 vertical edges joining them — 4 + 4 + 4 = 12 edges.
2. Which 3D shape has exactly 1 flat face?
A) cylinder
B) cone
C) sphere
D) cube
A cone has only 1 flat face — the circle on the bottom — because the rest of the shape is a curved surface tapering to a point.
3. A triangular prism has how many edges?
A) 6
B) 8
C) 9
D) 12
A triangular prism has 3 edges around each triangular end (3 + 3 = 6) plus 3 edges connecting the two triangles, which totals 9 edges.
4. Which shape has more vertices: a cube or a square pyramid?
A) cube (8 vertices)
B) square pyramid (5 vertices)
C) they have the same
D) neither has vertices
A cube has 8 vertices (4 on top, 4 on bottom) while a square pyramid only has 5 (4 on its base plus 1 point), so the cube has more.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A square pyramid has 4 triangular faces.
A square pyramid sits on one square base, and each of the 4 sides of that base has a triangular face reaching up to the point on top.
2. A cube has 4 more edges than a square pyramid.
A cube has 12 edges and a square pyramid has 8 edges, so 12 − 8 = 4 more edges on the cube.
3. A rectangular prism has 6 faces that come in matching pairs.
A rectangular prism has 6 faces arranged as 3 matching pairs — top/bottom, front/back, and left/right — each pair the same size.
4. A triangular prism has 3 rectangular faces.
The two triangular ends of a triangular prism are connected by 3 rectangles that wrap around the three straight sides of the triangle.
5. A square pyramid has 8 edges.
A square pyramid has 4 edges around its square base plus 4 edges going up from each corner to the top point, adding up to 8 edges.