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- Surface Areas and Volumes - Exercise 13.1
- Surface Areas and Volumes - Exercise 13.2
- Surface Areas and Volumes - Exercise 13.3
- Surface Areas and Volumes - Exercise 13.4
- Surface Areas and Volumes - Exercise 13.5
- Surface Areas and Volumes - Exercise 13.6
- Surface Areas and Volumes - Exercise 13.7
- Surface Areas and Volumes - Exercise 13.8
- Surface Areas and Volumes - Exercise 13.9

Question 1 Surface Areas and Volumes - Exercise 13.4

Find the surface area of a sphere of radius:

(i) 10.5cm (ii) 5.6 cm (iii) 14cm

(Assume π=22/7)

Answer:

"hello students welcome to lido q a video
session
i am saf your maths tutor and question
for today is
find the surface area of the sphere of
radius
first 10.5 centimeter second 5.6
centimeter
third 14 centimeter assume pi
is equal to 22 by 7
here general formula for the surface
area of the sphere
is 4 pi r square
now in first one the radius is given the
10.5 centimeter
so r is equal to ten point five
centimeter
so surface area is four pi r square
4 into 22 by 7 pi value is 22 by 7
and r is 10.5
and square so
solving this you will get
one three eight six
one three eight six centimeter
square in the second one
you have radius as 5.6 centimeter
so r is equal to 5.6 centimeter
surface area is 4 pi r square
substitute the values you will get 4
into 22 by 7
into 5.6 square
so this is 394.24
centimeter square in third one
radius is given that is 14 centimeter
surface area is again four pi
r square substitute the values
and you will get 4 into 22 by 7
into 14 square and this is
2464
centimeter square this is our final
answer
for all the three sub questions if you
have any queries
you can drop it in our comment section
and subscribe to lido for more such q a
thank you for watching
"

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