A day full of math games & activities. Find one near you.
A day full of math games & activities. Find one near you.
A day full of math games & activities. Find one near you.
A day full of math games & activities. Find one near you.
Find the total surface area of a hemisphere of radius 10 cm. (Use π = 3.14)
Solution:
A hemisphere is exactly half of a sphere having one circular surface at the top.
The total surface area of a hemisphere is half of the surface area of a sphere along with the top circular area added to it.
TSA of hemisphere = (4πr2)/2 + πr2 = 3πr2
The radius of the hemisphere, r = 10cm
Total Surface area = 3πr2
= 3 × 3.14 × 10cm × 10cm
= 942 cm2
The total surface area of the hemisphere is 942 cm2..
☛ Check: Class 9 Maths NCERT Solutions Chapter 13
Video Solution:
Find the total surface area of a hemisphere of radius 10 cm. (Use π = 3.14)
Class 9 Maths NCERT Solutions Chapter 13 Exercise 13.4 Question 3
Summary:
It is given that there is a hemisphere of radius 10 cm. We have found that the total surface area of the hemisphere is 942 cm2.
☛ Related Questions:
- The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the ratio of surface areas of the balloon in the two cases.
- A hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost of tin-plating it on the inside at the rate of ₹16 per 100 cm².
- Find the radius of a sphere whose surface area is 154 cm².
- The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas.