To do this question, we have to ask ourself, what formula do you use to find the surface area of a sphere.
The answer should be known to you, but it is 4πr2.
Since we know how to find the surface area for a full sphere, then finding the surface for a half sphere is just half the job.
You use the formula for the full sphere 4πr2, and divide it by 2... so (4πr2) / 2 .
Voila!
The surface area of a semicircle has the round surface which is half a sphere and also has the flat surface which is a circle.
Surface area of half a sphere = 2*pi*radius2 Surface area = 200*pi = 628.3185307 square units.
Find the surface area of the full sphere [ A = 4 pi R2 ] and then take half of it. You wind up with [ 2 pi R2 ] for the outside surface area of a half sphere, or [ 4 pi R2 ] for the (inside + outside) surface area of the half sphere. (Since the inside and outside are now both exposed to the weather, you probably want to paint both surfaces.)
100.48
The surface area of a sphere is 4(3.14)R2where R is the radius of the sphere so the surface area of your dome is half of that. 2(314)R2
The surface area of a semicircle has the round surface which is half a sphere and also has the flat surface which is a circle.
Surface area of half a sphere = 2*pi*radius2 Surface area = 200*pi = 628.3185307 square units.
Find the surface area of the full sphere [ A = 4 pi R2 ] and then take half of it. You wind up with [ 2 pi R2 ] for the outside surface area of a half sphere, or [ 4 pi R2 ] for the (inside + outside) surface area of the half sphere. (Since the inside and outside are now both exposed to the weather, you probably want to paint both surfaces.)
100.48
The surface area of a sphere is 4(3.14)R2where R is the radius of the sphere so the surface area of your dome is half of that. 2(314)R2
The answer for the hemisphere is half the volume of a sphere, which is given by the formula (2/3)πr³, where r is the radius. The surface area of a hemisphere is half the surface area of a sphere, given by the formula 2πr².
1500pi
Surface area of a sphere (a rounded ball) = 4*pi*radius2 Surface area of half a sphere = 2*pi*radius2
It is: 2*pi*radius2 square units
Tricky. You need to flatten out the surface to work it out. Depends on the shape - if it's like a hemisphere then you can use the properties of a sphere - volume = 4/3 Pi R3 and surface area = 4 Pi R2 so if your dome is like half a sphere then its surface area = 2 Pi R2 and you can measure the radius R so can work it out!
picture a sphere. the surface area of a sphere is 4*pi*r^2.now, cut it in half. the surface area is 4*pi*r^2 / 2 =2*pi*r^2this is without including the bottom circular base
If the radius of the hemispheres is 4, then that leave 4 units for the length if the straight part of the cylinder. Total surface area = surface area of 1/2 sphere of radius 4 + lateral surface area of cylinder of radius 4 and height 4 + surface area of 1/2 sphere of radius 4. = surface area of sphere of radius 4 + lateral surface area of cylinder of radius 4 = 4*3*pi*43 + pi*42*4 = 469.1 cubic units.