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## Perimeter

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**Perimeter**Units of length Perimeters Area Counting squares www.mathsrevision.com Area Rectangle Area of Triangle Created by Mr. Lafferty Maths Dept.**Starter Questions**Q1. Does 5m = 500cm Q2. Find two numbers that multiply to give 18 and subtract to give 3. Q3. Write 583 000 in words. www.mathsrevision.com Q4. True or false Created by Mr. Lafferty Maths Dept.**Units of Length**Learning Intention Success Criteria • To know the 4 units of length. • 1. To explain the 4 metric units of length and how to convert between them. 2. Be able to convert between them. www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**This is of a centimetre and is**about the width of a sewing needle. Units of Length The 4 units of length are : The metre : This is the standard unit of length and is approximately the distance from your nose to the end of your outstretched arm. 100th The centimetre : This is of a metre and is about the width of your pinky nail. www.mathsrevision.com The millimetre : 1000 The kilometre : This is metres and is about the the length of 10 football pitches. Created by Mr. Lafferty Maths Dept.**Units of Length Converting Measurements**kilometres (km) metres (m) www.mathsrevision.com centimetres (cm) millimetres (mm) Created by Mr. Lafferty Maths Dept.**Units of Length Converting Measurements**Examples Convert 2m to cm : 2 x 100 = 200 cm Convert 4km to m : 4 x 1000 = 4000 m www.mathsrevision.com Convert 34cm to mm : 34 x 10 = 340 mm Convert 50cm to m : 50 ÷ 100 = 0.5 m Created by Mr. Lafferty Maths Dept.**Units of Length Converting Measurements**Now try Exercise Ch (page ) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**Starter Questions**www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**Perimeter**Learning Intention Success Criteria • To know the term perimeter of a shape. • 1. To understand the term perimeter of a shape. 2. Calculate the perimeter of a shape. www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**Perimeter**What is perimeter ? www.mathsrevision.com Hint answer is on the screen ! Created by Mr. Lafferty Maths Dept.**Perimeter**www.mathsrevision.com Perimeter Created by Mr. Lafferty Maths Dept.**Perimeter**www.mathsrevision.com Perimeter Created by Mr. Lafferty Maths Dept.**Perimeter**Perimeter is the distance round the outside of a2D shape www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**Perimeter**6cm Calculate the perimeter of the rectangle below. 3cm www.mathsrevision.com Perimeter = 6 + 3 + 6 + 3 18cm = Created by Mr. Lafferty Maths Dept.**Perimeter**3cm 5cm www.mathsrevision.com 4cm Perimeter = 3 + 5 + 4 = 12cm Created by Mr. Lafferty Maths Dept.**Perimeter**10cm Calculate the perimeter of the rectangle. 4cm www.mathsrevision.com Perimeter = 28cm Created by Mr. Lafferty Maths Dept.**Perimeter**Calculate the perimeter of the triangle below. 13cm Perimeter = 30cm www.mathsrevision.com 12cm 5cm Created by Mr. Lafferty Maths Dept.**x m**4 m 9 m 8 m 4 m Perimeter 12 m Perimeter Problem Below is a drawing of the school building. Calculate the perimeter. x = 12 – 9 =3 m www.mathsrevision.com = 12 + 8 + 3 + 4 + 9 + 4 = 40 m Created by Mr. Lafferty Maths Dept.**Perimeter**Now try Exercise Ch (page ) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**Starter Questions**www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**Area Counting Squares**Learning Intention Success Criteria • To understand the term area. • 1. To explain area in terms of counting squares. • Find the area by counting squares. www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**1cm**1cm Area Counting Squares The area of a shape is simply defined by : “the amount of space a shape takes up.” Think of a square measuring 1 cm by 1cm we say it is : www.mathsrevision.com 1cm2 ( 1 square centimetre ) Created by Mr. Lafferty Maths Dept.**Area Counting Squares**Now try Exercise Ch (page ) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**Starter Questions**Q1. What is the time difference 09:28 and 11:55 Q2. www.mathsrevision.com Q3. Convert 23metres to (a) cm (b) mm Created by Mr. Lafferty Maths Dept.**Area of a Rectangle**Learning Intention Success Criteria • To be able to state area formula for a rectangle. • 1. To come up with a formula • for the area of a • rectangle. • Apply formula correctly. • (showing working) www.mathsrevision.com • Use the formula to solve problems. • Answer containing • appropriate units Created by Mr. Lafferty Maths Dept.**1 cm**Area = length x breadth L B A = A = L x B X = X X = Area of a Rectangle B B L L L = length www.mathsrevision.com L B B = Breadth 3 1 3 4 3 12 3 2 6 Must learn formula ! Created by Mr. Lafferty Maths Dept.**Area of a Rectangle**Example Find the area of the rectangle opposite B = 2cm L = 9cm Area = Length x Breadth A = L x B www.mathsrevision.com A = 9 x 2 A = 18 cm2 Created by Mr. Lafferty Maths Dept.**Area of a Rectangle**Now try Exercise Ch (page ) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**Starter Questions**Q1. True or false Q2. True or false the perimeter of the shape is 130cm 13cm www.mathsrevision.com 10cm Q3. Convert 57 metres to (a) cm (b) mm Created by Mr. Lafferty Maths Dept.**Area of A Right-Angled Triangle**Learning Intention Success Criteria • Know area of a right-angled triangle formula • 1. Use the area of a rectangle formula to help us to come up with a formula to calculate the area of any right-angled triangle. 2. Use formula to work out area of triangle. www.mathsrevision.com 3. Show all working and units. Created by Mr. Lafferty Maths Dept.**Area of A Right-Angled Triangle**Calculate the area of this shape A = L x b A = 10 x 8 8cm www.mathsrevision.com A = 80cm2 10cm Created by Mr. Lafferty Maths Dept.**Area of A Right-Angled Triangle**Base www.mathsrevision.com Length Created by Mr. Lafferty Maths Dept.**6cm**12cm Area of A Right-Angled Triangle Calculate the area of this shape www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**4cm**3cm Area of A Right-Angled Triangle Calculate the area of this shape www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**Area of A Right-Angled Triangle**Now try Exercise Ch (page ) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.