Find the diamter of a circle if its area is 706.9mm²

Step-by-step explanation:

The formula of an area of a circle:

r - radius

We have

Substitute:

         divide both sides by π

       use π ≈ 3.14

The diameter d = 2r.

Therefore

30mm

Step-by-step explanation:

A=

Substitute 706.9 for A and for 3.14

706.9= 3.14             divided both sides by 706.9

when you divided 3.14 by 3.14 it will cross and when you divide 706.9 by 3.14 it will give you 225.

15 times 15 is 225

radius= 15

d=2r

multiply 15 by 2

the answer is 30.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

d i think

step-by-step explanation: