Stage 9 - Q9 - 4 marks
20145
A right prism has an L-shaped cross-section: outer arms 4 cm and 3 cm, both of thickness 1 cm. Its length is 8 cm. Explain its number of symmetry planes.
Not to scale
\(4\text{ cm}\)
\(3\text{ cm}\)
\(8\text{ cm}\)
Hint
Separate cross-section reflections from the central transverse plane.