Question

Question 1
Write ‘True’ or ‘False’ and justify your answer in the following :
Two identical solid hemispheres of equal base radius r cm are stuck together along their bases. The total surface area of the combination $6\pi r^2$.

Answer 1

The given statement is false.
Curved surface area of a hemisphere $=2\pi r^2$ Here, two identical solid hemispheres of equal radius are stuck together . So. Base of both hemispheres is common.
$\therefore$ Total surface area of the combination $=2\pi r^2+2\pi r^2=4\pi r^2$