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Calculating Areas of Circles - Lesson 6

Learn how to find the areas of circles using the formula A = πr^2. Practice examples and step-by-step instructions included.

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Calculating Areas of Circles - Lesson 6

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  1. Transparency 6 Click the mouse button or press the Space Bar to display the answers.

  2. Splash Screen

  3. Example 6-2b Objective Find the areas of circles

  4. Example 6-2b Vocabulary Pi () The Greek letter that represents an irrational number approximately equal to 3.14 You are to use the pi key on the calculator

  5. Lesson 6 Contents Example 1Find the Area of Circles Example 2Find the Area of Circles

  6. Example 6-1a Find the area of the circle. Round to nearest hundredth A =   (4 cm)2 Write formula for area of circle Replace r with 4 cm Follow Order of Operations P E MD AS Must do exponents before multiplying 1/2

  7. Example 6-1a Find the area of the circle. Round to nearest hundredth A =   (4 cm)2 Find square of 4 cm A =   16 cm2 Multiply by  Answer: A = 50.27 cm2 1/2

  8. Example 6-1b Find the area of the circle. Round to nearest hundredth Answer: A = 346.36 ft2 1/2

  9. Example 6-2a Find the area of a circle with a diameter of 11.6 centimeters. 11.6 cm Draw the circle and label the diameter Remember: Diameter goes all the way across the circle and twice the radius Write formula for area of circle 2/2

  10. Example 6-2a Find the area of a circle with a diameter of 11.6 centimeters. 11.6 cm Since diameter is given must divide the diameter by 2 to find radius A =   (5.8 cm)2 11.6  2 = 5.8 Replace r with 5.8 cm 2/2

  11. Example 6-2a Find the area of a circle with a diameter of 11.6 centimeters. 11.6 cm Follow Order of Operations P E MD AS A =   (5.8 cm)2 A =   33.64 cm2 Must do exponents before multiplying Answer: Find square of 5.8 cm A = 105.68 cm2 Multiply by  2/2

  12. Example 6-2b Find the area of a circle with a diameter of 16.4 inches. Answer: A = 211.24 in2 2/2

  13. End of Lesson 6 Assignment

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