When two identical solid hemispheres of radius r are joined along their bases, they form a solid sphere, and the total surface area of this combination is 4πr² cm². This is because the bases of the hemispheres are glued together, so they are no longer exposed surface area, leaving only the combined curved surface areas of the two hemispheres.
Two identical solid hemispheres of equal base radius r cm are stuck together along their bases. The total surface area of the combination is?
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Question context
This question is part of 📐 Geometry within the broader 🧠 Aptitude Mastery subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.