S4_3_Credit_Similarity_Chapter_3

# S4_3_Credit_Similarity_Chapter_3 - S4 Credit Scales...

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Unformatted text preview: S4 Credit Scales (Representative Fractions) Scale Drawings Mathematical Mathematical Similarity Similarity www.mathsrevision.com Working Out Scale Factor Similar Triangles 1 Similar Triangles 2 Similar Figures Scale Factor in 2D (Area) Surface Area of similar Solids Scale Factor 3D (Volume) Similar Triangles 3 with Algebra S4 Credit Monday 13 February 2012 Monday 13 February 2012 Starter Questions Starter Questions- + 2 5 6 x x + 3 1 1 2 7 6 Q1. Factorise Q2. Find x and y when Q3. f(x) = x 2 3x Find f(-2) Q4. Calculate www.mathsrevision.com 3x + y = 10 x - 3y = -10 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Learning Intention Learning Intention Success Criteria Success Criteria 1. 1. To understand the term scale. To understand the term scale. 1. To explain the term scale in the context of a map. 2. Calculate the real life and map distances. Scales Scales S4 Credit 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. www.mathsrevision.com In order to make sense of a map or scale diagram the representative fraction ( scale factor) must be known. Scales Scales S4 Credit 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. www.mathsrevision.com In order to make sense of a map or scale diagram the scale factor must be known. 4 cm For this scale model 1 cm represents 1m This means for every 1 metre of the actual car, 1cm is drawn on the map. Scales Scales S4 Credit 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. www.mathsrevision.com 6cm The scale of this drawing is 1cm = 5m What is the actual length of the tree ? 6 x 5 = 30m Scales Scales S4 Credit 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. www.mathsrevision.com 5cm The scale of this drawing is 1cm = 90cm What is the actual length of the bus in metres ? 5 x 90 = 450cm 4.5m Scales Scales S4 Credit 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. Now try Ex 2.1 Ch 3 (page 51) Odd questions www.mathsrevision.com Scales Scales S4 Credit Monday 13 February 2012 Monday 13 February 2012 Starter Questions Starter Questions + + = 2 5 3 x x Q1. Find the roots for the quadratic to 1 decimal place Q2. Solve the trig equation 3cos x 2 = 0 Q3. Find Q4. The sun is 92 million miles away....
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## S4_3_Credit_Similarity_Chapter_3 - S4 Credit Scales...

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