The cost of a circular table is directly proportional to the square of the radius " A circular table - Maths - Integers

Question

The cost of a circular table is directly proportional to the square
of the radius
" A circular table with a radius of 40cm cost £50
" What is the cost of a circular table with a radius of 60cm?

Brijendra Pal · Accepted Answer

HI,
According to the question Cost C α r 2  C = kr2Now when r = 40 cm then C = 50 50 = k ×1600k = 5160=132so C =  r 232now when radius r = 60 then cost = 60232= 360032=112
5 dollor 
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The cost of a circular table is directly proportional to the square of the radius. " A circular table with a radius of 40cm cost £50. " What is the cost of a circular table with a radius of 60cm?

The cost of a circular table is directly proportional to the square of the radius.
" A circular table with a radius of 40cm cost £50.
" What is the cost of a circular table with a radius of 60cm?