What is the difference between the total surface area and the curved surface area of a hemisphere when the radius is 6.3cm? (Take π=
7
22
​
)

For a hemisphere of radius r:
Total Surface Area (TSA) = 3πr
2


Curved Surface Area (CSA) = 2πr
2


The difference between TSA and CSA is:

Difference=3πr
2
−2πr
2
=πr
2

Given:

Radius (r) = 6.3cm

π=
7
22
​


Difference=
7
22
​
×6.3×6.3
Difference=22×0.9×6.3
Difference=19.8×6.3=124.74cm
2