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29-May-14Created by Mr. Lafferty1 Drawing Triangles 2.Select SAS triangles 2.Select SAS triangles 3.Select ASA triangles 3.Select ASA triangles 4.Select SSS triangles 4.Select SSS triangles 1.Using a Protractor 1.Using a Protractor www.mathsrevision.com MTH 3.16a

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29-May-14Created by Mr. Lafferty2 (SAS) Starter Questions Q3.Calculate the missing angles. 80 o Q1.Convert the percentages to fractions. (a)30%(b)60% Q2.Write down all the factors of 16. Q4.Round the following to 1 decimal place. (a)4.549(b)6.551

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29-May-143 A 180 o Protractor Outside scale from 0 o to 180 o going in a clockwise direction. Inside scale from 0 o to 180 o going in an anti-clockwise direction.

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29-May-144 You need to be able to measure an angle to the nearest degree. To help you do this you should always: 1. Look directly down onto the cross point. 2. Always use the protractor in a horizontal manner as shown below.

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29-May-145 1 2 Measuring Angles with a 180 o Protractor 0 on the outside so use outside scale 0 on the inside so use inside scale 67 o 50 o

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29-May-146 3 4 Measuring Angles with a 180 o Protractor 0 on the outside so use outside scale 0 on the inside so use inside scale 135 o 120 o

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29-May-14Created by Mr. Lafferty7 We are learning to construct a triangle given the length of two sides and the included angle Aim of the Lesson Drawing SAS Triangles

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29-May-14Created by Mr. Lafferty8 Drawing SAS Triangles SAS Triangles Angle Side Side

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29-May-14Created by Mr. Lafferty9 Drawing SAS Triangles Toolkit required 1.Ruler 2.Protractor 3.Pencil & Paper

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29-May-14Created by Mr. Lafferty10 Drawing SAS Triangles Example : Draw to scale the triangle ABC with AB = 6cm and angle CAB = 30 o and AC = 5cm Step 1Draw line AB=6cm AB C Step 2Measure angle CAB from A Step 3Draw the line AC = 5cm through X. Label it C. Step 4Join C to B. Check angles add to 180 o A B C 30 o X

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29-May-14Created by Mr. Lafferty11 Drawing SAS Triangles Some practice Teejay Book Teejay Book Page 169 Exercise 1

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29-May-14Created by Mr. Lafferty12 (ASA) Starter Questions Q3.List the first 4 prime numbers. Q1.Convert to the 24 hour clock. (a)7:25 pm (b)6:50 am Q2.Write down lowest common multiple of 3, 4, 5. Q4.Round the following to nearest 1000. (a)12,501(b)369,765

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29-May-14Created by Mr. Lafferty13 Drawing SAS Triangles Part 2 : ASA triangles

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29-May-14Created by Mr. Lafferty14 We are learning to construct a triangle given two angles and the length of the side in between. Aim of the Lesson Drawing ASA Triangles

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29-May-14Created by Mr. Lafferty15 Drawing ASA Triangles ASA Triangles Side Angle Angle

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29-May-14Created by Mr. Lafferty16 Drawing ASA Triangles Toolkit required 1.Ruler 2.Protractor 3.Pencil & Paper

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29-May-14Created by Mr. Lafferty17 Drawing ASA Triangles Example : Draw to scale the triangle PQR with PQ = 8cm and angle RPQ = 30 o and RQP = 40 o Step 1Draw line PQ P Q R Step 2Measure Angle RPQ from P Step 3Measure angle RQP from Q Step 4Intersection point is R Check angles add to 180 o P Q R

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29-May-14Created by Mr. Lafferty18 Drawing ASA Triangles Some practice Teejay Book Teejay Book Page 171 Exercise 2

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29-May-14Created by Mr. Lafferty19 (SSS) Starter Questions Q3.List the prime numbers between 10 and 20. Q1.Convert to the 12 hour clock. (a)17:15 (b)05:40 Q2.Write down lowest common multiple of 3, 4, 5. Q4.Round the following to nearest 100. (a)13,551(b)369,449

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29-May-14Created by Mr. Lafferty20 Drawing SSS Triangles Part 3 : SSS triangles

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29-May-14Created by Mr. Lafferty21 We are learning to construct a triangle given the length of three sides. Aim of the Lesson Drawing SSS Triangles

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29-May-14Created by Mr. Lafferty22 Drawing SSS Triangles SSS Triangles Side Side Side

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29-May-14Created by Mr. Lafferty23 2.Compass Drawing SSS Triangles Toolkit required 1.Ruler 3.Pencil & Paper

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29-May-14Created by Mr. Lafferty24 Drawing SSS Triangles Example : Draw to scale the triangle XYZ with XY = 3cm and XZ = 5cm and YZ = 4cm Step 1Draw line XY=3cm XY Z Step 2Use your compass to draw part of a circlecentre X radius XZ=5cm Step 3Use your compass to draw part of a circle centre Y radius YZ=4cm Step 4Intersection point is labelled Z Check angles add to 180 o X y Z Step 5Draw in line XZ and YZ to complete triangle

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29-May-14Created by Mr. Lafferty25 Drawing SSS Triangles Some practice Teejay Book Teejay Book Page 173 Exercise 3

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