Question

it is based on class 9 activity 31








Observation
Diameter (d) of the spherical ball = ………….. units
Radius (r) = ………….. units
Length of string / used to cover ball = …………. units
Length of string a used to cover one circle = ………….. units
Hence, l = 4 x ……………
Surface area of a sphere of radius, (r) = 4 x Area of a circle of radius = 4πr²​

Answer 1

Answer:

sorry I don't know answer please follow and mark me

Answer 2

Answer:

Observation

 Diameter (d) of the spherical ball = ……5…….. units

 Radius (r) = ………2.5….. units

 Length of string / used to cover ball = …7………. units

 Length of string a used to cover one circle = ………8….. units

 Hence, l = 4 x …5…………

 Surface area of a sphere of radius, (r) = 4 x Area of a circle of radius = 4πr²