Brick units — dimensions of a half queen closer In brick masonry terminology, what are the dimensions (in cm) of a half queen closer when using standard bricks corresponding to the given options?

Introduction / Context:
Closers are partial bricks used to maintain proper bonding at corners and junctions. Among them, queen closers and half queen closers are common in English bond. Knowing their sizes ensures correct lap and alignment in brickwork.

Given Data / Assumptions:

• Standard brick dimensions corresponding to the options are implied.
• A queen closer is obtained by cutting a brick lengthwise into two equal halves.
• A half queen closer is obtained by halving a queen closer again across its width.

Concept / Approach:
If a full brick has length L, width W, and height H, then a queen closer has dimensions L/2 x W x H. A half queen closer is L/2 x W/2 x H. Mapping to the option set where L ≈ 18 cm and W ≈ 9 cm (implied by the 9 cm entries), a half queen closer becomes 9 cm x 4.5 cm x 9 cm, matching option (c).

Step-by-Step Solution:

Verification / Alternative check:
Bond layouts in English bond show half queen closers next to quoin headers to maintain vertical joints in successive courses.

Why Other Options Are Wrong:

• 9 x 9 x 9: Queen closer (not half queen closer) in this option set context.
• 9 x 9 x 4.5: Dimensions do not follow the longitudinal halving sequence.
• 1.8 x 4.5 x 9: Over-reduction of length; not used in standard bonding.
• none of these: Incorrect because option (c) is correct.

Common Pitfalls:
Mixing up queen and king closers; confusing which dimension is halved at each step.

Final Answer:
9 cm x 4.5 cm x 9 cm