 Hello and welcome to the session. Let us discuss the following question. It says find the surface area of the sphere of radius 10.5 centimeter, 5.6 centimeter and 14 centimeter. Let us first know the formula for the surface area of sphere. Surface area of sphere is equal to 4 pi r square where r is the radius of sphere is equal to 22 upon 7. So this knowledge will work as key idea for the question. Let us now move on to the solution and let us discuss the first part. The radius given to us is 10.5 centimeter. Now the surface area of sphere is equal to 4 pi r square. Now substitute the value of pi and r. Pi is 22 upon 7 and r is 10.5 centimeter. So it is 10.5 square. This is equal to 4 into 22 upon 7 into 10.5 into 10.5 which is again equal to 4 into 22 upon 7 into 10.5 into 10.5 is 110.25 and on simplifying we get the area as 1386 centimeter square since the unit of area is centimeter square as the unit of radius is given to be centimeter so the unit of area will be centimeter square. Let us now discuss the second part. The radius given to us is 5.6 centimeter and the surface area of sphere is equal to 4 pi r square. Let us substitute the values of pi and r. So we have 4 into 22 upon 7 into 5.6 into 5.6 which is again equal to 4 into 22 upon 7 into 56 upon 10 into 56 upon 10. 7 into 8 is 56 and 2 4's are 8. 2 5's are 10. And on simplifying we get the area as 394.25 centimeter square. Let us now discuss the third part. Radius given to us is 14 centimeter. The surface area of sphere is equal to 4 pi r square. Pi is 22 upon 7 r is 14 14 into 14. In simplifying this we get the area as 2464 centimeter square. Hence answer to the first part of the question is 1386 centimeter square and to the second part answer is 394.24 centimeter square and answer to the third part is 2464 centimeter square. So this completes the question. For such questions do remember the formula for the surface area of sphere which is 4 pi r square. So why for now take care have a good day.