Question

Help please, i really need it because its almost due

Answer 1

Option 3 and Option 4

Explanation:

A = pi × r²

r² = A/pi

r² = A × (pi^-1)

r = A^½ × pi^-½

r = A^½ × pi/pi^½

Answer 2

D sqrt( A ) sqrt(pi) / pi = r

Explanation:

The area of a circle is given by

A = pi r^2

To find r

Divide each side of the equation by pi

A / pi = pi r^2 /pi

A / pi = r^2

Take the square root of each side

sqrt(A / pi )= sqrt( r^2)

sqrt(A / pi )= r

We do not like leaving square roots in the denominator, so multiply by sqrt(pi)/sqrt(pi))

sqrt(A / pi ) *sqrt(pi)/sqrt(pi))

sqrt( A ) sqrt(pi) / pi = r