 Hello and welcome to the session, let us discuss the following question. It says find the total surface area of a hemisphere of radius 10 centimetre, use pi is equal to 3.14. Let us first write the formula for total surface area of hemisphere, it is equal to 3 pi r square where r is the radius of the hemisphere. So this is the key idea, let us now move on to the solution. The radius of hemisphere is given to us as 10 centimetre, now the total surface area of hemisphere is equal to 3 pi r square, r is 10 centimetre, so the unit of area will be centimetre square. Let us now substitute the values of pi and r in the formula. So we have 3 into pi, pi is 3.14 into r square r is 10, this is equal to 3 into 3.14 into 10 into 10 and this is again equal to 3 into 314 upon 100 into 110 into 10 is 100 and this is equal to 942 centimetre square. Hence the area of the, so total surface area of hemisphere is 942 centimetre square. So that is all for this session, goodbye and take care.