Question

Which of the following equations could be solved for a radius? Select all that apply.

Answer 1

Answer:

A = π · (r²)

Step-by-step explanation:

$A =$π · r² is the area of a circle.

While π · r² · h can also give you the radius, it can only do so for the Volume $V$, not the Area $A$.

$V=lwh$ doesn't really apply for a circular object, as it requires the length and width. For circular objects, both are equal to the diameter of the object, and 2² · r² · h does not equal the Volume.

$V=$ π · r³ seems awfully like the volume of a sphere, but there's something missing. The true volume of a sphere is $V=\frac{4}{3}$ · π · r³, not $V=$ π · r³.

$A=\frac{1}{2}*b*h$ only applies for triangles.

Answer 2

It’s the first three equations (r represents radius) the rest of the equations do not use radius