Solve Geometry Applications: Circles and Irregular Figures: exemplo 9.43

Problema e solução em inglês, como no livro original.

Find the diameter of a circle with a circumference of $47.1$ centimeters.

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Find the diameter of a circle with circumference of $94.2$ centimeters.

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Step 1. Read the problem. Draw the figure and label it with the given information.
Step 2. Identify what you are looking for.	the diameter of the circle
Step 3. Name. Choose a variable to represent it.	Let d = the diameter of the circle
Step 4. Translate.
Write the formula. Substitute, using 3.14 to approximate $π$ .
Step 5. Solve.
Step 6. Check: $47.1 \overset{?}{=} (3.14) (15)$ $47.1 = 47.1 ✓$
Step 7. Answer the question.	The diameter of the circle is approximately 15 centimeters.

Step 1. Read the problem. Draw the figure and label it with the given information.
Step 2. Identify what you are looking for.	the diameter of the circle
Step 3. Name. Choose a variable to represent it.	Let d = the diameter of the circle
Step 4. Translate.
Write the formula. Substitute, using 3.14 to approximate $π$ .
Step 5. Solve.
Step 6. Check: $47.1 \overset{?}{=} (3.14) (15)$ $47.1 = 47.1 ✓$
Step 7. Answer the question.	The diameter of the circle is approximately 15 centimeters.