Page 244 - Math Smart - 7

Q Complete the pattern.
Use the lines of symmetry as a guide.

O Journal Writing

Describe these 2D shapes and solids to someone who cannot see or feel them.
Talk about the number of sides, side lengths, number of angles, angle sizes, faces, vertices,
edges and orientation where relevant.
a) b)
J L

n r

d) e)

Mathematics Connect %,

Rotational symmetry in wind turbines

Wind turbines use the energy in moving air (wind) to
generate renewable energy. The blades of this wind
turbine have rotation symmetry. Without rotational
symmetry, the blades would 'wobble' in the strong wind
as they are not balanced or stable. This would make it
harder for the blades to rotate and less energy would be
generated.

Shapes and Symmetry
1