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Find the radius or diameter of each circle with the given dimensions. 1. d = 6 cm 2. r = 11 ft Find the circumference of each circle. Use 3.14 for π. Round.

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Presentation on theme: "Find the radius or diameter of each circle with the given dimensions. 1. d = 6 cm 2. r = 11 ft Find the circumference of each circle. Use 3.14 for π. Round."— Presentation transcript:

1 Find the radius or diameter of each circle with the given dimensions. 1. d = 6 cm 2. r = 11 ft Find the circumference of each circle. Use 3.14 for π. Round to the nearest tenth if necessary. 3. 4. 5. Charlotte has a trampoline in her backyard. The diameter of the trampoline is 14 feet. What method can Charlotte use to find the circumference of the trampoline? Course 2, Lesson 8-2

2 ANSWERS 1. r = 3 cm 2. d = 22 ft 3. 31.4 cm 4. 40.8 in. 5. Multiply the diameter by π.

3 Geometry Course 2, Lesson 8-2 HOW do measurements help you describe real-world objects?

4 Course 2, Lesson 8-2 Common Core State Standards © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved. Geometry 7.G.4 Know the formulas for the area and circumference of a circle and use them to solve problems; give an informal derivation of the relationship between the circumference and area of a circle. Mathematical Practices 1Make sense of problems and persevere in solving them. 3Construct viable arguments and critique the reasoning of others. 4Model with mathematics.

5 To find the area of a circle To find the area of a semicircle Course 2, Lesson 8-2 Geometry

6 Course 2, Lesson 8-2 Geometry semicircle

7 Course 2, Lesson 8-2 Geometry WordsThe area A of a circle equals Model the product of and the square of its radius r. SymbolsA =

8 How did what you learned today help you answer the Course 2, Lesson 8-2 Geometry HOW do measurements help you describe real-world objects?

9 How did what you learned today help you answer the Course 2, Lesson 8-2 Geometry HOW do measurements help you describe real-world objects? Sample answers: To find the area of a circular object, such as the area of a radio signal To find the area of a semicircular object, such as window

10 Suppose you have a circular rug in your living room. Describe how you would find the area of the rug and which measures you would need to know in order to find its area. Course 2, Lesson 8-2 Ratios and Proportional RelationshipsFunctionsGeometry

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