Class 8 · Chapter 10

Visualising Solid Shapes

Nets of solids; views (top, front, side); Euler's formula.

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Tip: open the NCERT PDF for the original chapter text alongside the notes here.

Detailed theory

Top, front, side views; used to fully describe 3-D objects on paper (engineering drawings, architecture).

Key concepts & formulas

A net is a

2

-D unfolded shape of a solid.

A cube has

11

distinct nets.

Euler:

F + V - E = 2

for convex polyhedra.

Top view = view from above; front view = view from front.

Prism: top and bottom identical; pyramid: converges to an apex.