www mathsrevision com The Circle Circumference of the

www. mathsrevision. com The Circle Circumference of the circle Diameter = Circumference ÷ Area of a circle Fractions of a circle 11/5/2020 Created by Mr. Lafferty Maths Dept.

www. mathsrevision. com Starter Questions 3 cm 6 cm 11/5/2020 Created by Mr. Lafferty Maths Dept.

Main Parts of a Circle www. mathsrevision. com Revision of Level E Learning Intention Success Criteria 1. To revise the basics of the circle. 1. Know the terms circumference, diameter and radius. 2. Identify them on a circle. 3. Calculate the circumference using formula. 11/5/2020 Created by Mr. Lafferty Maths Dept.

Main Parts of a Circle www. mathsrevision. com Revision of Level E Main parts of the circle radius O Diameter Circumference 11/5/2020 Created by Mr. Lafferty Maths Dept.

Main part of a Circle Revision of Level E Example : Find the length of the circumference (Perimeter) of each circle 2 c 10 cm m 11/5/2020 Created by Mr. Lafferty Maths Dept.

Main part of a Circle www. mathsrevision. com Revision of Level E Now try Exercise 1 Ch 29 (page 118) 11/5/2020 Created by Mr. Lafferty Maths Dept.

www. mathsrevision. com Starter Questions 6 5 4 11/5/2020 Created by Mr. Lafferty Maths Dept.

Finding the Diameter www. mathsrevision. com The Circle Learning Intention 1. To explain how we can find diameter of a circle if we know the circumference. Success Criteria 1. Understand how to rearrange circumference formula to find diameter. 2. Solve diameter problems. 11/5/2020 Created by Mr. Lafferty Maths Dept.

Finding the Diameter www. mathsrevision. com The Circle We can easily rearrange the circumference formula so that we have the diameter D on one side. You have 1 minute to rearrange equation. Remember change side change sign 11/5/2020 Created by Mr. Lafferty Maths Dept.

Finding the Diameter The Circle C = 62. 8 cm C =15. 7 cm m 5 c www. mathsrevision. com Example : Find the diameter of each circle given the circumference. 20 cm 11/5/2020 Created by Mr. Lafferty Maths Dept.

Finding the Diameter www. mathsrevision. com The Circle Now try Exercise 2 Ch 29 (page 121) 11/5/2020 Created by Mr. Lafferty Maths Dept.

www. mathsrevision. com Starter Questions 11/5/2020 Created by Mr. Lafferty Maths Dept.

www. mathsrevision. com Starter Questions 6 5 4 11/5/2020 Created by Mr. Lafferty Maths Dept.

Area of a Circle Peeling an orange A x O circumference A x B O What do we call the distance OA in terms of the large circle. What do we call the distance AB in terms of the large circle. 11/5/2020 Created by Mr. Lafferty Maths Dept.

Area of a Circle www. mathsrevision. com A x B What is the formula for the area of a right-angle triangle. O Use this formula to work out the area for a circle. 11/5/2020 Created by Mr. Lafferty Maths Dept.

Area of a circle www. mathsrevision. com Q. Find the area of the circle ? Solution 4 cm 11/5/2020 Created by Mr. Lafferty Maths Dept.

Area of a circle S 3 www. mathsrevision. com Q. The diameter of the circle is 60 cm. Find area of the circle? Solution 11/5/2020 Created by Mr. Lafferty Maths Dept.

www. mathsrevision. com Area of a Circle What have we learned so far 11/5/2020 Created by Mr. Lafferty Maths Dept.

www. mathsrevision. com Area of a Circle Now try Exercise 3 Ch 29 (page 123) 11/5/2020 Created by Mr. Lafferty Maths Dept.

www. mathsrevision. com Starter Questions 11/5/2020 Created by Mr. Lafferty Maths Dept.

www. mathsrevision. com Starter Questions 4 11/5/2020 Created by Mr. Lafferty Maths Dept.

Mixed Problems www. mathsrevision. com The Circle Learning Intention 1. To give some examples of problems that we can solve by applying our knowledge of circles and of the course so far. 11/5/2020 Success Criteria 1. Recall knowledge of circles so far. 2. Solve mixed problems by applying all our knowledge so far. Created by Mr. Lafferty Maths Dept.

Mixed Problems www. mathsrevision. com The Circle Things to think about when do exercise. The area of a semicircle ……. Find whole circle then half it ! The area of a quarter circle ……. Find whole circle then quarter it ! Composite area ……. Find each area and add them together ! 11/5/2020 Created by Mr. Lafferty Maths Dept.

Mixed Problems The Circle www. mathsrevision. com Example 1 : Find the area of the shape Area = rectangle + semicircle 5 cm 20 cm 11/5/2020 Created by Mr. Lafferty Maths Dept.

Mixed Problems www. mathsrevision. com The Circle Example 2 : A circle is contained in a square. Find the grey shaded area below. 8 cm 11/5/2020 Area = square - circle Created by Mr. Lafferty Maths Dept.

Mixed Problems www. mathsrevision. com The Circle Now try Exercise 4 Ch 29 (page 125) 11/5/2020 Created by Mr. Lafferty Maths Dept.