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Prime Time Circle the seven prime numbers that, when added together, equal 75. 3, 11, 14, 13, 5, 17, 12, 6, 19, 23, 7, 9 Remember a prime number is a number that has only two factors, 1 and itself. 2 is prime : 1x2

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Prime Time Solution = 75

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Area of Circles Lesson 11-6

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Review of Circles r d The radius of a circle is half of the diameter. Divide the diameter by 2 to get the radius.

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**Area of a Circle Area = r²**

The area of a circle equals the product of pi () and the square of its radius. r Area = r²

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**Find the Area of the Circle Round the answer to the nearest tenth.**

Area = r² A = (4²) A = (16) A = 50.3 cm² 4 cm

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**Find the Area of the Circle Round the answer to the nearest tenth.**

Area = r² A = (8²) A = (64) A = in² 8 in

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**Find the Area of the Circle Round the answer to the nearest tenth.**

Area = r² A = (5.5²) A = (30.25) A = 95.0 ft² 11 ft Use the diameter to find the radius. 11 ÷ 2 = 5.5 Radius = 5.5 ft

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**Find the Area of the Circle Round the answer to the nearest tenth.**

Area = r² A = (3.25²) A = ( ) A = 33.2 m² 6.5 m Use the diameter to find the radius. 6.5 ÷ 2 = 3.25 Radius = 3.25 m

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**Find the area to the nearest tenth.**

25.6 m 9.8 in Area = r² A = (12.8²) A = (163.84) A = m² Area = r² A = (9.8²) A = (96.04) A = in²

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**Area of a Semi-Circle Area = r² A = (13²) A = (169) A = 530.9 ft²**

530.9 ft² is the area of the whole circle. How can you find the area of half the circle. Divide the area by 2. A semi- circle is half of a circle. Answer: ft²

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**Homework Lesson 11-6 # 2-16 even**

TEST: On Friday, lesson 11-5 (area of triangles and trapezoids), lesson 11-6 (area of circles), and lesson 11-7 (we will complete this tomorrow)

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