4-3: TEKS Practice

• 1. Find the area of the circle. Use 3.14 for π. Round to the nearest hundredth as needed.

• 2. A water sprinkler sends water out in a circular pattern. How large is the watered area if the radius of the watering pattern is 18 ft? Write an exact answer in terms of π. Simplify your answer.

• 3. Find the area of the circle. Use 3.14 for π. Round to the nearest hundredth as needed.

• 4. Think About the Process

• a. What is the first step in finding the exact area of this circle?

• A. Multiply the diameter by π to find the circumference.

• B. Divide the diameter by π to find the circumference.

• C. Divide the diameter by 2 to find the radius.

• D. Multiply the diameter by 2 to find the radius.

• b. The exact area of the circle is m2.

• 5. A certain coin is a circle with diameter 18 mm. What is the exact area of each side of the coin? Write your answer in terms of π. Simplify your answer.

• 6. Find the area of the circle. Use 3.14 for π. Round to the nearest hundredth as needed.

• 7. The radius of a circular sign is 12 inches. Equal parts of the sign are painted red and yellow. How many square inches are painted each color? Use 3.14 for π. Round to the nearest hundredth as needed.

8.

• a. Writing The diameter of Circle X is 18 cm. The diameter of Circle Y is 31 cm. Which circle has the greater area and by how much? Use 3.14 for π.

• b. Describe two ways you can compare the areas of two circles. Explain when you might prefer to use each.

• 9.

• a. Reasoning Find the exact area of the circle in terms of π. Simplify your answer.

• b. Explain how you could use the area of a parallelogram to estimate the area of the circle.

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