Circles Circumference, Diameter and Radius. Important Info. You’ll need: notebook, pencil, and formula card. Pause. Rewind. Volume. Questions?

Slides:

Advertisements

Similar presentations

Perimeter and Area. Objectives Calculate the area of given geometric figures. Calculate the perimeter of given geometric figures. Use the Pythagorean.

Advertisements

Perimeter and Area Please view this tutorial and answer the follow-up questions on loose leaf to turn in to your teacher.

Definition: A circle is the set of all points on a plane that is a fixed distance from the center.

Perimeter Rectangles, Squares, and Triangles Perimeter Measures the distance around the edge of any flat object. To find the perimeter of any figure,

3.4 Area and Circumference 1 Circle A circle is a plane figure that consists of all points that lie the same distance from a fixed point. The fixed point.

Chapter 9 Geometry © 2008 Pearson Addison-Wesley. All rights reserved.

  investigate the relationship between the diameter and circumference of a circle.

$100 Area of Parallelograms Area of Triangles Perimeter And Area Area of Trapezoids Area of Compound Figures & Area and Circumference of Circles $200.

© 2008 Pearson Addison-Wesley. All rights reserved Chapter 1 Section 9-3 Perimeter, Area, and Circumference.

You will learn to find the perimeter and area for different shapes and the circumference of circles. s s Perimeter = 4s or s+s+s+s Area = s 2 l w P =

Unit 10 Review Area Formulas. FOR EACH FIGURE: IMAGINE the shape THINK of its AREA FORMULA.

Areas and Volume Area is a measure of the surface covered by a given shape Figures with straight sides (polygons) are easy to measure Square centimetres:

Section 9-4 Perimeter, Area, and Circumference.

Area of Composite Shapes We are learning to…find the area of composite shapes (shapes made up of more than one figure). Monday, September 07, 2015.

2 pt 3 pt 4 pt 5pt 1 pt 2 pt 3 pt 4 pt 5 pt 1 pt 2pt 3 pt 4pt 5 pt 1pt 2pt 3 pt 4 pt 5 pt 1 pt 2 pt 3 pt 4pt 5 pt 1pt Triangles Polygons Similar or Congruent?

Geometry n What is the length of side ‘n’ in the triangle at the right? Form ratios of corresponding sides: Use any two ratios to form a.

Jeopardy Geometry Circles 1 Triangles 2 Polygons 3 Formulas 4 Angles 5 Pot Luck

Who wants to be a Millionaire? Hosted by Mrs. Kuykendall.

Warm-Up What is the perimeter of a regular decagon with side length s = 6?

Chapter 10 Test Formula Review.  Find the circumference of a circle with a diameter of 10. Identify the formula needed for the following questions.

Holt CA Course 1 9-4Circumference and Area MG2.1 Use formulas routinely for finding the perimeter and area of basic two- dimensional figures and the surface.

Objective Apply formulas for perimeter, area, and circumference.

10.4 Area and Circumference. Solving Area Problem Find the area of polygon shown at right. Solution: A = (3)(13)f 2 + (3)(6 + 3)f 2 = 39f f 2 =

1-5: USING FORMULAS IN GEOMETRY. PERIMETER & AREA RectangleSquareTriangle P = 2l + 2w or 2(l + w) A = lw P = 4s A = s 2 P = a + b + c A = ½ bh.

Circumference & Area of a Circle

Chapter 4 L4-5 Notes: Perimeter. Vocabulary The distance around any closed figure is called its perimeter. P for “Plus” all Sides.

1.8: Perimeter, Circumference, and Area

Warm Up Evaluate. Round to the nearest hundredth () 6. (3)

Mrs. Planavsky 4 th Grade.  Find the circumference of a circle  Find the measurement of a diameter of the circle.

Warm-Up Find the area: Circumference and Area Circles.

Perimeter & Circumference Return to table of contents.

CIRCUMFERENCE AND AREA

Holt CA Course 1 9-4Circumference and Area Warm Up Warm Up California Standards California Standards Lesson Presentation Lesson PresentationPreview.

1.7 - Find Perimeter, Circumference, and Area. Perimeter: Length around a shape. Measured in u cm, in, ft, yd.

Definition: Rectangle A rectangle is a quadrilateral with four right angles.

11.2 Perimeter and Circumference Presented by Lynn Beck 11 in 32 in Radius Diameter.

© 2010 Pearson Prentice Hall. All rights reserved. CHAPTER 10 Geometry.

8 th Grade Math Chart Brisa Alcorta 2 nd Period. Pi The ratio of the circumference of a circle to its diameter. Approximate value: 3.14.

Do now: Work out the circumferences and areas of these circles 10 cm 12 cm 9 cm 2 cm 1.5 cm.

Objectives: - Identify & apply formulas for the circumference & area of a circle. HSPA Problem of the Day: Which figure below does not have an area of.

Lesson 1.7 Find Perimeter, Circumference, and Area.

Section 1.7. Recall that perimeter is the distance around a figure, circumference is the distance around a circle, and area is the amount of surface covered.

Agriculture Mechanics I.  Linear ◦ Comes from the word line.  Linear Measure ◦ The measurement of lines ◦ A line is the distance between two points.

Finding Perimeter and Area Review. Perimeter The distance around the outside of an object. 10 feet 8 feet 10 feet Perimeter = = 36 feet.

+ Bell Work Solve 25 ⅚ -18 ⅜ 5 ⅛ + 7 ⅘. + Bell Work Answer 25 ⅚ -18 ⅜ 25 20/24 – 18 9/ /24 5 ⅛ + 7 ⅘ 5 5/ / /40.

Miss G’s Measurement Madness ! Perimeter, Circumference, Area, Volume, and Surface Area.

Perimeter, Circumference and Area. Perimeter and Circumference Perimeter : The distance around a geometric figure. Circumference: The distance around.

Area & Perimeter. Page ________ of Notebook Title: Area and Perimeter Title: Area and Perimeter Objective: Find Area and Perimeter Objective: Find Area.

Exercise Simplify s + s + s + s. 4s4s4s4s. Simplify l + w + l + w. 2l + 2w Exercise.

9.1 PERIMETER AND AREA OF PARALLELOGRAMS Objective: Students find the perimeter and area of parallelograms.

20) 108° 21) 80° 22) 70° 23) 123° 24) 38° 25) 167° 26) 10° 27) 154° 28) 105 = 2x – 11; x = 58 29) 6x x = 180; x = 23.

Lesson 8.7 Concept: How to find the circumference of a circle. Guidelines: *The diameter of a circle extends from one side of the circle to the other.

G-11 (1-5) Using formulas in Geometry I can use formulas to compute perimeter and area of triangles, squares, rectangles, and circles.

March 8 th,  Problem 1) A) What is the formula for the area of a circle? B) What is the formula for the circumference of a circle? C) How do these.

Area of a Rectangle & Square

Welcome to RSP Math Mrs.Muljodiredjo.

Perimeter, Area, and Circumference

Perimeter Area and Circumference

Maths Unit 3 – Area & Perimeter

CIRCLES and POLYGONS.

UNIT 8: 2-D MEASUREMENTS PERIMETER AREA SQUARE RECTANGLE PARALLELOGRAM

Maths Unit 3 – Area & Perimeter

Warm Up: Find the circumference of the circle. Round to nearest hundredth 1. r = 3.4 m d = 9 cm Find the area of the figures. 3. Circle with.

9.4 – Perimeter, Area, and Circumference

Using Substitution to Evaluate Algebraic Expressions and Formulas

1.5 Using Formulas in Geometry

Circles and Circumference

Maths Unit 6 – Area & Perimeter

Presentation transcript:

Circles Circumference, Diameter and Radius

Important Info. You’ll need: notebook, pencil, and formula card. Pause. Rewind. Volume. Questions?

Area & Perimeter Area: Covering Perimeter: Surrounding Polygons: Triangles, Rectangles, Squares, Parallelograms, Trapezoids

What is a circle? Not a polygon. A plane figure with three or more straight sides and angles. Definition: a closed plane figure made up of all the points the same distance from a point called the center.

E Circle E F G H EFEGEH = radius

E Circle E F EF diameter I + EI = IF ½ ½ radius + radius = diameter r + r = dr + r = d 2r = d2r = d

Things You Should Know... Radius (Plural: Radii) A straight line from the center of a circle to it circumference. It is half of the diameter. Radius = r Diameter A straight line passing through the center of a circle connecting 2 points on the circumference. It is twice the radius. Diameter = d

Circumference Distance around a circle. C=2πr or C=πd π = 22/7 ≈ 3.14

Finding Circumference C=2πr Use this formula when you are given the radius. C=πd Use this formula when you are given the diameter.

Find the circumference of each circle. Use 3.14 for π. 4 cm

Find the circumference of each circle. Use 3.14 for π. 6 in

Find the circumference of each circle. Use 3.14 for π. 2.1 m

Find the circumference of each circle. Use 3.14 for π. 3.3 ft

How much do you know?

Questions Before school tomorrow. Extra help on Mondays and Wednesdays.