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Nina [5.8K]
3 years ago
15

Help please, i really need it because its almost due

Mathematics
2 answers:
Maru [420]3 years ago
6 0

Answer:

Option 3 and Option 4

Step-by-step explanation:

A = pi × r²

r² = A/pi

r² = A × (pi^-1)

r = A^½ × pi^-½

r = A^½ × pi/pi^½

nata0808 [166]3 years ago
3 0

Answer:

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

Step-by-step 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

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