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The area of circle Z is 64Pi ft2. Circle Z is shown. Radius D has length r. R = StartRoot StartFraction Area Over pi EndFraction EndRoot What is the value of r? r = 4 ft r = 8 ft r = 16 ft r = 32 ft

Sagot :

Answer:

r = 8 ft

Step-by-step explanation:

Area of a circle => πr²

We are told in the question that:

The area of circle Z is 64Pi ft²

= 64π ft²

What is the value of r

We equate

πr² = 64 π

r² = 64 π/π

r² = 64

We square root both sides.

√r² = √64

r =>8 ft

The radius of the given circle Z is 8ft which was solved using the area of the circle

Data;

  • Area = 64π ft^2
  • radius = r

Area of a Circle

The formula of area of a circle is given as

[tex]A = \pi r^2[/tex]

Let's substitute the values and solve

[tex]A = 64\pi\\A = \pi r^2 \\64 \pi = \pi r^2\\[/tex]

divide through by π

[tex]64\pi = \pi r^2\\\\64 = r^2\\[/tex]

Let's take the square root of both sides

[tex]r^2 = 64\\r = \sqrt{64} \\r = 8ft[/tex]

The radius of the circle Z is 8ft

Learn more on area of a circle here;

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