HELP! with finding the radius of the cicle with the given area.?

Question

Use 3.14 for pie.
A = area
1.A = 12.56 mm^2
2. A = 314 cm^2

Answer 1

First just start of by knowing (What is the formula for finding the area of a circle)

A=3.14r^2

Since you have A(area) substitute it in and solve.
12.56=3.14r^2
12.56/3.14=r^2
r^2=4
[r=2mm]

314=3.14r^2
314/3.14=r^2
r^2=100
[r=10cm]

Answer 2

Area = pi times radius squared

question 1. A = 12.56 mm squared

applying the formula

12.56 = 3.1416 x r squared

r squared = 12.56 divided by 3.1416

r squared = 3.9979

r = root of 3.9979 = 1.999 mm

Question 2.

A = Pi radius squared

314 = 3.1416 times radius squared

radius squared = 314 divided by 3.1416 = 99.9491

radius = root of 99.9491

r = 9.997 cm

Answer 3

Area formula for a circle is

a = π r²

a / π = r²

r² = √a / π

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r² = √12.56 / 3.141592654

r ² = √3.99797217

r = 1.999492978

r = 2 mm rounded up

- - - - - - - - - - - - -

r² = √314 / 3.141592654

r² = √99.994930426

r = 9.997464892

r = 10 cm Rounded up

- - - - - - -s-

Answer 4

I'd rather use apples for pie.

A =πr^2
r^2 = A/π
r = √A/π

1.
r = √(12.56 mm^2/3.14)
r = √4 mm^2
r = 2 mm

2.
r = √(314 cm^2/3.14)
r = √(100 cm^2)
r = 10 cm

Answer 5

Area equals pi multiplied by the radius squared. Simply divide both sides of the equation by pi, and then take the square root of both sides of the equation. This will solve for the radius.

Answer 6

Area = pi x radius squared

radius = square root of (area divided by pi)
pi = 3.14 (approximately)

Answer 7

Area = pi times the radius squared
therefore
Area / pi = the radius squared
translation
the Area divided by pi, then get the square root of that dividend!

you can do it!!!!