Starter Questions Thursday

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Presentation transcript:

Starter Questions Thursday Q1. Find all missing angles Q2. List the prime numbers between 10 and 20. www.mathsrevision.com Q3. Solve 4cm Q4. Calculate the area of the shape. 5cm Wednesday, 29 May 2019 Created by Mr Lafferty 10cm

The Area of a circle Aim of Today’s Lesson To come up with and be able to use the formula for calculating the area of a circle www.mathsrevision.com Wednesday, 29 May 2019 Created by Mr Lafferty

And lay them out side by side The Area of a circle S3 If we break the circle into equal sectors And lay them out side by side We get very close to a rectangle. 1 2 3 4 5 6 7 8 www.mathsrevision.com 5 6 7 8 2 4 3 1 Wednesday, 29 May 2019 Created by Mr Lafferty

The Area of a circle S3 www.mathsrevision.com 8 2 4 6 3 1 5 7 If we cut the sectors Thinner and thinner then we get closer and closer to a rectangle. Hence we can represent the area of a circle by a rectangle. 1 2 3 4 5 6 7 8 thinner and thinner sectors www.mathsrevision.com Wednesday, 29 May 2019 Created by Mr Lafferty

The Area of a circle S3 www.mathsrevision.com But the area inside this rectangle is also the area of the circle Wednesday, 29 May 2019 Created by Mr Lafferty

The Area of a circle S3 www.mathsrevision.com Q. Find the area of the circle ? Solution 4cm www.mathsrevision.com Wednesday, 29 May 2019 Created by Mr Lafferty

Begin Maths in Action Book The Area of a circle S3 Now it’s your turn ! Begin Maths in Action Book Ex9.1 page 194 Q1-2 www.mathsrevision.com Wednesday, 29 May 2019 Created by Mr Lafferty

The Area of a circle S3 www.mathsrevision.com Find area of the circle? The diameter of the circle is 60cm. Find area of the circle? Solution www.mathsrevision.com Wednesday, 29 May 2019 Created by Mr Lafferty

Begin Maths in Action Book The Area of a circle S3 Now it’s your turn ! Begin Maths in Action Book Ex9.1 page 194 Q3-4 www.mathsrevision.com Wednesday, 29 May 2019 Created by Mr Lafferty

The Area of a circle S3 www.mathsrevision.com Find its radius? The area of a circle is 12.64 cm2. Find its radius? Solution www.mathsrevision.com Wednesday, 29 May 2019 Created by Mr Lafferty

Begin Maths in Action Book The Area of a circle S3 Now it’s your turn ! Begin Maths in Action Book Ex9.1 page 194 Q5 onwards www.mathsrevision.com Wednesday, 29 May 2019 Created by Mr Lafferty