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Warm Up Evaluate. 1. 6  4 2 2. 5.6  2 3 Simplify each expression. 3. 6 + n – 4

Warm Up Evaluate. 1. 6  4 2 2. 5.6  2 3 Simplify each expression. 3. 6 + n – 4 4. 5( n + 1) . 96. 44.8. n + 2. 5 n + 5. Problem of the Day What is the area of a right triangle with legs measuring 31 in. and 21 in.?. 325.5 in 2. Learn to find the area of a circle .

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Warm Up Evaluate. 1. 6  4 2 2. 5.6  2 3 Simplify each expression. 3. 6 + n – 4

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  1. Warm Up Evaluate. 1. 6  42 2. 5.6  23 Simplify each expression. 3. 6 + n – 4 4. 5(n + 1) 96 44.8 n + 2 5n + 5

  2. Problem of the Day What is the area of a right triangle with legs measuring 31 in. and 21 in.? 325.5 in2

  3. Learn to find the area of a circle.

  4. A ≈ 3 • 202 A ≈ 3 • 400 A ≈ 1,200 m2 Additional Example 1A: Estimating the Area of a Circle Estimate the area of the circle. Use 3 to approximate . Write the formula for area. A = r2 Replace  with 3 and r with 20. Use the order of operations. Multiply.

  5. Additional Example 1B: Estimating the Area of a Circle Estimate the area of the circle. Use 3 to approximate .

  6. 24.8 m Check It Out: Example 1A Estimate the area of the circle. Use 3 to approximate .

  7. Check It Out: Example 1B Estimate the area of the circle. Use 3 to approximate . 20 m

  8. Additional Example 3: Application A drum head has a radius of 18 in. Find the area of the material covering the drum head. use 3.14 for . 18 in.

  9. Check It Out: Example 3 A cymbal has a diameter of 18 in. Find its area AND circumference. Use 3 for . 18 m

  10. Lesson Quizzes Standard Lesson Quiz Lesson Quiz for Student Response Systems

  11. Lesson Quiz: Part I Estimate the area of each circle. 1.2. 1,200 yd2 27 km2

  12. Lesson Quiz: Part II Find the area of each circle. Use for . 22 3.4. 7 1.54 m2 4.53 cm2 5. A coater has a diameter of 6 inches. Find the area of the largest cup the coaster can hold. Use 3.14 for . 28.26 in2

  13. Lesson Quiz for Student Response Systems • 1. Estimate the area of the circle. Use 3 for . • A. 48 km2 • B. 46 km2 • C. 44 km2 • D. 42 km2 4 km

  14. Lesson Quiz for Student Response Systems • 2. Estimate the area of the circle. Use 3 for . • A. 772 yd2 • B. 872 yd2 • C. 972 yd2 • D. 992 yd2 36 yd

  15. Lesson Quiz for Student Response Systems • 3. Estimate the area of the circle. Use 3 for . • A. 36.75 cm2 • B. 21 cm2 • C. 10.5 cm2 • D. 9.19 cm2 3.5 cm

  16. Lesson Quiz for Student Response Systems • 4. A circular table has a diameter of 8 feet. Identify the area of the table cloth needed to cover the table. Use 3.14 for . • A. 25.12 ft2 • B. 37.68 ft2 • C. 40.82 ft2 • D. 50.24 ft2

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