Exercise 2 Page 402

Consider the given circle.

Let's find the circumference of the circle. The circumference C of a circle with radius r is calculated using the formula below. C=2π r From the figure, we know that the radius of the circle is 1m. We can substitute 1 for r in the formula and then calculate C. We will use 3.14 as an estimate for π.

C=2π r

SubstituteII

r= 1, π= 3.14

C=2( 3.14)( 1)

Multiply

C=6.28

The circumference of the circle is approximately 6.28m.

Let's find the area of this circle. The area A of a circle with radius r is calculated using the formula below. A=π r^2 We can substitute 1 for r in the formula and then calculate A. We will use 3.14 as an estimate for π.

A=π r^2

SubstituteII

r= 1, π= 3.14

A=( 3.14)( 1^2)

CalcPow

Calculate power

A=(3.14)(1)

Multiply

A=3.14

The area of the circle is approximately 3.14m^2.

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More About Circles!

Are you interested in learning more about circles? Our Mathleaks original content can teach you all about them! Check out the following resources to see real-world uses for circumference and area, how circles compare to other shapes and why, as well as some higher level topics that you can look forward to learning about in Geometry and Algebra 2.

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Exercise 2 Page 402

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