Math Problem Statement

he radius of a circle is 1 centimetre. What is the circle's area?

Solution

To find the area of a circle, you can use the formula:

A=πr2A = \pi r^2

where:

  • AA is the area of the circle.
  • rr is the radius of the circle.

Given that the radius r=1r = 1 cm, we can substitute this value into the formula:

A=π(1)2=π×1=πA = \pi (1)^2 = \pi \times 1 = \pi

Therefore, the area of the circle is:

A=πsquare centimetersA = \pi \, \text{square centimeters}

Using the approximate value of π3.1416\pi \approx 3.1416:

A3.1416square centimetersA \approx 3.1416 \, \text{square centimeters}

Would you like more details or have any questions?

Here are 5 related questions for further exploration:

  1. What would the area be if the radius of the circle were doubled?
  2. How does the circumference of the circle compare to its area?
  3. What is the relationship between the diameter and the area of a circle?
  4. How do you calculate the area of a sector of a circle?
  5. What would the area be if the circle's radius were increased by 50%?

Tip: Remember that the area of a circle increases with the square of the radius, which means even a small increase in the radius can significantly increase the area.

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Math Problem Analysis

Mathematical Concepts

Geometry
Circle

Formulas

Area of a circle formula A = πr^2

Theorems

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Suitable Grade Level

Grades 6-8