Question

$a = 4\pi \: r ^{2}$

Make r the subject of this formula​

Answer 1

Step-by-step explanation:

A=4pr sq.

REWRITE THE EQUATION AS-

4prsq. =A

DEVIDE EACH TERM AS 4p AND SIMPLIFY

4p sq./4p = A/4p ..

CANCEL THE COMMON FACTORS..

P r sq. / P =A/4p

CANCEL THE COMMON FACTOR..

r sq. =A/4p

DEVIDE R SQ. BY P

r sq. =A/4p

TAKE THE SQ. ROOT OF BOTH SIDES OF THE EQUATION TO ELIMINATE THE EXPONENT ON THE LEFT SIDE..

R=+- √A/4p... ANSWER..

.so ...r.. has both negetive and positive solutions...

1) √A/4p

2) -√A/4p

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