Scaled Drawings & Compass Points Working with scales Scale Drawings www.mathsrevision.com Practical Scale Drawings Bearings 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Starter Questions 2cm www.mathsrevision.com 1cm 1cm 4-May-19 Created by Mr. Lafferty Maths Dept.

Scaled Drawings & Compass Points Learning Intention Success Criteria 1. To understand the term scaled drawing and how they are used in real life. To be able to understand the term scaled drawings. 2. Interpret scaled drawing into real-life measurements. www.mathsrevision.com 4-May-19 Created by Mr. Lafferty Maths Dept.

Scaled Drawings & Compass Points Definition A scale of 1 cm = 2m www.mathsrevision.com This simply means for every 1cm measured on a drawing this represents 2m in real-life. 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Scaled Drawings & Compass Points 4x25= 100cm 4cm 2cm 2x25 = 50cm www.mathsrevision.com The scale of this drawing is 1cm = 25cm What is the actual length and breadth of the TV ? 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Scaled Drawings & Compass Points 12x50 = 600cm = 6m 12cm Living room 8cm 8x50 = 400cm =4m www.mathsrevision.com The scale of this drawing living room is 1cm = 50cm What is the actual length and breadth of the room ? 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Scaled Drawings & Compass Points Now try Exercise 2 Ch5 (page 52) www.mathsrevision.com 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Starter Questions 14cm 7cm www.mathsrevision.com 10cm 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Scaled Drawings & Compass Points Learning Intention Success Criteria 1. Interpret information in a problem and create a suitable scaled drawing. 1. To draw a scale drawing given suitable information. www.mathsrevision.com 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Scaled Drawings & Compass Points Problem A garden is rectangular shape and has length 12m and breadth 8m. Draw a scale drawing using a suitable scale. 3cm www.mathsrevision.com 1cm = 4m Scale Garden 2cm 3cm = 12m Length 2cm = 8m Breadth 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Scaled Drawings & Compass Points Another way 6cm 1cm = 2m Scale 6cm = 12m Length 4cm 4cm = 8m Breadth www.mathsrevision.com Key Points Work out suitable scale Work out length and breadth 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Scaled Drawings & Compass Points Now try Exercise 3 Ch5 (page 55) www.mathsrevision.com 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Starter Questions www.mathsrevision.com 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Scaled Drawings & Compass Points Learning Intention Success Criteria 1. Interpret information in a problem to create a suitable scaled drawing. 1. To solve real-life problems using scaled draws. www.mathsrevision.com 2. Use a scale drawing to solve a given problem. 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Scaled Drawings & Compass Points Problem The sketch shows a flag-pole YT supported by a wire. The distance from X to Y is 6m and angle TXY = 55o. 55o X T Y www.mathsrevision.com Make a scaled drawing and work Out the real height of the pole. Use a scale of 1cm = 2m 6m 4-May-19 Created by Mr. Lafferty Maths Dept.

Scaled Drawings & Compass Points X T Y 6m Scaled Drawings & Compass Points Solution Using a scale of 1cm = 2m T Step 1: Draw line XY=3cm Step 2: Draw a line straight up from Y. Step 3: Measure angle 55o from X. Step 4: Draw line from X to vertical line and mark T at crossover point. www.mathsrevision.com Step 5: Measure length YT. 4.3cm Step 6: Multiply length YT. by scale factor. 4.3 x 2 = 8.6m X Y Flag pole is 8.6m high 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Scaled Drawings & Compass Points Now try Exercise 4 Ch5 (page 58) www.mathsrevision.com 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Starter Questions www.mathsrevision.com 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Scaled Drawings & Compass Points Learning Intention Success Criteria 1. Understand compass points. 1. To understand the compass points. 2. Work out simple directions. www.mathsrevision.com 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Compass Points N S E W 090o 360/000o 270o 180o NW 315o NE 045o SW 225o SE 135o 4-May-19 Created by Mr. Lafferty Maths Dept.

360/000o 090o 180o 270o W E N S Air Traffic Controller Control Tower 030o 330o Estimate the bearing of each aircraft from the centre of the radar screen. 315o 045o 290o 075o 250o 225o 200o 135o 110o 170o 4-May-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Scaled Drawings & Compass Points Now try Exercise 5 Ch5 (page 61) www.mathsrevision.com 4-May-19 Created by Mr. Lafferty Maths Dept.