Two wooden solid hemispheres of same radii r are joined at a point ...

Question

Two wooden solid hemispheres of same radii r are joined at a point (flat faces outward, forming an hourglass shape). The total surface area of the object is:

Accepted Answer

Each hemisphere contributes only its curved surface area since only the curved parts are exposed. $$TSA = 2\pi r^2+2\pi r^2=4\pi r^2$$

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