Write the names of 3D shapes in the correct places. (1) A — All faces look the same; B — All faces do not look the same. All faces look the same All faces do not look the same A B Diagram (1) from the book. Circle A: all faces look the same. Circle B: all faces do not look the same.

Look at every face of the solid and ask: are they all alike? A — All faces look the same B — All faces do not look the same cube (6 equal squares) cuboid (long faces and short faces) triangular pyramid with equal triangles cylinder (2 circles and 1 curved face) sphere (only one curved surface, the same all over) cone (1 circle and 1 curved face) square pyramid (1 square and 4 triangles) triangular prism (2 triangles and 3 rectangles) Why it happens: A cube is made of six squares of exactly the same size, so turning it makes no difference. A cuboid has a long face and a short face, so the faces do not match.

(2) A — Shapes with curved edges; B — Shapes with straight edges. Shapes with curved edges Shapes with straight edges A B Diagram (2) from the book. Circle A: shapes with curved edges. Circle B: shapes with straight edges.

Run a finger along the edges. Does the finger go straight, or does it curve round? A — curved edges B — straight edges cylinder (2 round rims) cube, cuboid cone (1 round rim) triangular prism, hexagonal prism triangular pyramid, square pyramid Tip: The sphere goes in neither circle — it has no edge at all. Why it happens: An edge is the line where two faces meet. Where a flat face meets a curved face the line has to bend, so the edge is curved.

(3) A — Shapes with rectangular faces; B — Shapes with triangular faces; the overlap — Shapes with both rectangular and triangular faces. Shapes with rectangular faces Shapes with triangular faces A B Shapes with both rectangular and triangular faces Diagram (3) from the book. The two circles overla

A shape goes in the overlap if it has both kinds of face. A only — rectangular faces Overlap — both B only — triangular faces cube triangular prism triangular pyramid cuboid square pyramid (its base is a square) pentagonal pyramid hexagonal prism Why it happens: A triangular prism has 3 rectangles on its sides and a triangle at each end, so it belongs to both groups at once. That is exactly why the two circles are drawn crossing each other.

NCERT Solutions for Class 4th Maths Chapter 1 Write the names of 3D shapes in the correct places — Sorting 3D Shapes

Book page 6 Updated on2026-09-19

Q1.

Write the names of 3D shapes in the correct places. (1) A — All faces look the same; B — All faces do not look the same.

Diagram (1) from the book. Circle A: all faces look the same. Circle B: all faces do not look the same.

Answer

Look at every face of the solid and ask: are they all alike?

A — All faces look the same	B — All faces do not look the same
cube (6 equal squares)	cuboid (long faces and short faces)
triangular pyramid with equal triangles	cylinder (2 circles and 1 curved face)
sphere (only one curved surface, the same all over)	cone (1 circle and 1 curved face)
	square pyramid (1 square and 4 triangles)
	triangular prism (2 triangles and 3 rectangles)

Why it happens: A cube is made of six squares of exactly the same size, so turning it makes no difference. A cuboid has a long face and a short face, so the faces do not match.

Q2.

(2) A — Shapes with curved edges; B — Shapes with straight edges.

Diagram (2) from the book. Circle A: shapes with curved edges. Circle B: shapes with straight edges.

Answer

Run a finger along the edges. Does the finger go straight, or does it curve round?

A — curved edges	B — straight edges
cylinder (2 round rims)	cube, cuboid
cone (1 round rim)	triangular prism, hexagonal prism
	triangular pyramid, square pyramid

Tip: The sphere goes in neither circle — it has no edge at all.

Why it happens: An edge is the line where two faces meet. Where a flat face meets a curved face the line has to bend, so the edge is curved.

Q3.

(3) A — Shapes with rectangular faces; B — Shapes with triangular faces; the overlap — Shapes with both rectangular and triangular faces.

Diagram (3) from the book. The two circles overlap, and the overlap is for shapes with both kinds of face.

Answer

A shape goes in the overlap if it has both kinds of face.

A only — rectangular faces	Overlap — both	B only — triangular faces
cube	triangular prism	triangular pyramid
cuboid	square pyramid (its base is a square)	pentagonal pyramid
hexagonal prism

Why it happens: A triangular prism has 3 rectangles on its sides and a triangle at each end, so it belongs to both groups at once. That is exactly why the two circles are drawn crossing each other.

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