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Mathematics 9 Online
ebenezer:

Two spheres have a combined volume of 148 cubic inches and a combined surface area of 160 square inches. Find the radii of the two spheres. What are the equations used to find the radii?

ebenezer:

no diagram

jhonyy9:

you need to know formula for volume of a sphere and formula for surface area of a sphere

jhonyy9:

so will get two equations with two unknowed terms

ebenezer:

help me to solve it

ebenezer:

the formula for volume is 4/3pir^3 the surface area is 4pir^2

jhonyy9:

two spheres note sphere 1 and sphere 2 with radius r_1 and r_2

jhonyy9:

combined volume mean V_1 +V_2

ebenezer:

so how will i get the radius

jhonyy9:

V_1 = [4pi*(r_1)^3]/3

jhonyy9:

V_2 =[4pi*(r_2)^3]/3

jhonyy9:

do you understand the way ?

ebenezer:

yes

ebenezer:

what about the area of the surface

silvernight269:

@dude

ebenezer:

4pi[r_1^3 +r_2^3]=148 *3

ebenezer:

so how will i get the r since the r^3

ebenezer:

are you there

ebenezer:

i need solution to the question

ebenezer:

i mean jhonyy9

silvernight269:

nope

sillybilly123:

https://www.youtube.com/watch?v=tAU6HYpvzUU

sillybilly123:

posted anti-back-to-front

sillybilly123:

if these spheres intersect, what happens? if they don't, can there be 3 or 4 or 100,000 non-interstecting spheres?

sillybilly123:

|dw:1539466273290:dw|

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