Math Problem Statement

The circumference of a circle is 6π cm. What is the area, in square centimeters? Express your answer in terms of π.

Solution

Let’s solve the problem step by step:

  1. Given information:

    • Circumference of the circle is 6π6\pi cm.
    • Formula for the circumference of a circle is C=2πrC = 2\pi r, where rr is the radius.
  2. Find the radius rr: C=2πr    6π=2πrC = 2\pi r \implies 6\pi = 2\pi r Divide both sides by 2π2\pi: r=6π2π=3cm.r = \frac{6\pi}{2\pi} = 3 \, \text{cm.}

  3. Formula for the area of a circle: A=πr2A = \pi r^2

  4. Substitute r=3r = 3: A=π(3)2=π9=9πcm2A = \pi (3)^2 = \pi \cdot 9 = 9\pi \, \text{cm}^2

Final Answer:

A=9πcm2A = 9\pi \, \text{cm}^2

Would you like further clarification or more detailed steps?


Here are 5 related questions for further practice:

  1. If the radius of a circle is 4cm4 \, \text{cm}, what is its circumference in terms of π\pi?
  2. A circle has an area of 25πcm225\pi \, \text{cm}^2. What is its radius?
  3. How does doubling the radius affect the area of a circle?
  4. If the diameter of a circle is 10cm10 \, \text{cm}, what is its area in terms of π\pi?
  5. What is the relationship between the radius and area of a circle?

Tip: Always identify key formulas for circles: C=2πrC = 2\pi r and A=πr2A = \pi r^2.

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Math Problem Analysis

Mathematical Concepts

Geometry
Circles

Formulas

Circumference of a circle: C = 2πr
Area of a circle: A = πr²

Theorems

Relationship between radius and area of a circle

Suitable Grade Level

Grades 7-9