The surface area of a sphere is 616m2. what is the volume of-the sphere (correct to two significant figures)? (take π = 3.142)

Afakriya

4 months ago

surface area(A)=4πr^2
given A=616m
and π=22÷7=3.142
so
616=4×3.142×r^2
616=12.6r^2
divide both sides by 12.6
r^2=616÷12.6=49
take the square of both sides
r=√48=7m
and
volume=4/3πr^3
=4/3×22/7×7^3
=1436.941
=1400cm^2 to two significant figures

Kingforxtune

4 months ago

and yet I was marked wrong
so annoying where I'll get answer right and I'll be marked wrong

kubby2020

8 years ago

no given explanation