Math Problem Statement

The radius of a circle is 8 millimeters. What is the circle's area? Use ​𝜋 ≈ 3.14 and round your answer to the nearest hundredth.

Solution

The formula for the area of a circle is:

A=πr2A = \pi r^2

where rr is the radius.

Given that the radius r=8r = 8 mm and using π3.14\pi \approx 3.14, we calculate:

A=3.14×(8)2A = 3.14 \times (8)^2

A=3.14×64A = 3.14 \times 64

A=200.96 mm2A = 200.96 \text{ mm}^2

Final Answer:

200.96 mm2\mathbf{200.96 \text{ mm}^2}

Would you like a step-by-step breakdown or any additional details?

Related Questions:

  1. What is the circumference of the same circle using π3.14\pi \approx 3.14?
  2. If the radius were doubled, how would the area change?
  3. How would the area change if π\pi were approximated as 3.1416 instead?
  4. What is the area of a semicircle with the same radius?
  5. How does the area formula for a circle compare to that of a square?

Math Tip:

Always check if rounding affects your final answer, especially when working with approximations of π\pi.

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Math Problem Analysis

Mathematical Concepts

Geometry
Circle Area
Pi Approximation

Formulas

Area of a circle: A = πr²

Theorems

Area formula for circles

Suitable Grade Level

Grades 6-8