18. Three-dimensional Figures

Click the correct answer (True & False).

According to the Euler’s relation, the sum of number of faces and vertices exceed the number of edges by 2.

True

False

Click the correct answer.

How many faces does a triangular prism have?

5

4

3

2

Click each box on the left and also click on the matching box of the right.

Match the solids with the number of faces (F), edges (E) and vertices (V) they have.

Octagonal pyramid

Cube

Hexagonal prism

Icosahedron

Dodecahedron

F = 9; E = 16; V = 9

F = 6; E = 12;V = 8

F = 8; E = 18; V = 12

F = 20; E = 30; V = 12

F = 12; E = 30; V = 20

Click the correct answer.
In a polyhedron, a line segment joining any two points lies entirely inside the polyhedron.

regular

concave

convex

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