SOLUTION: the radius, r, of a circle has been increased by k. both r and k are measured in the same units. write a formula for the area of the new circle . expand and simplify
r= r+k
A=p
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Question 769894: the radius, r, of a circle has been increased by k. both r and k are measured in the same units. write a formula for the area of the new circle . expand and simplify
r= r+k
A=pi*r^2
= pi*(r+k)^2
=pi*(r^2+2rk+k^2)
is this correct or something's wrong?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Original radius, r.
Increased radius, r+k.
For this situation, because you are not writing some kind of computer code, do NOT say r=r+k.
The subscript is for original or initial.
The new area when radius increases by k.
But your work in your last two steps is good. The new area IS .
You just cannot say because it is wrong.
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