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**Drawing Triangles 1. Using a Protractor 2. Select SAS triangles**

MTH 3.16a 1. Using a Protractor 2. Select SAS triangles 3. Select ASA triangles 4. Select SSS triangles 31-Mar-17 Created by Mr. Lafferty

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**(SAS) Starter Questions**

Q1. Convert the percentages to fractions. (a) 30% (b) 60% Q2. Write down all the factors of 16. Q3. Calculate the missing angles. 80o Q4. Round the following to 1 decimal place. (a) 4.549 (b) 6.551 31-Mar-17 Created by Mr. Lafferty

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A 180o Protractor Outside scale from o to 180o going in a clockwise direction. Inside scale from o to 180o going in an anti-clockwise direction. 31-Mar-17

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**You need to be able to measure an angle to the nearest degree**

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. 31-Mar-17

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**Measuring Angles with a 180o Protractor**

2 0 on the inside so use inside scale 67o 0 on the outside so use outside scale 31-Mar-17

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**Measuring Angles with a 180o Protractor 120o**

3 Measuring Angles with a 180o Protractor 120o 4 0 on the inside so use inside scale 135o 0 on the outside so use outside scale 31-Mar-17

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**Drawing SAS Triangles ‘We are learning to construct a triangle given**

Aim of the Lesson ‘We are learning to construct a triangle given the length of two sides and the included angle’ 31-Mar-17 Created by Mr. Lafferty

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**Drawing SAS Triangles SAS Triangles Side Side Angle 31-Mar-17**

Created by Mr. Lafferty

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**Drawing SAS Triangles Toolkit required Ruler 2. Protractor**

3. Pencil & Paper 31-Mar-17 Created by Mr. Lafferty

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**Drawing SAS Triangles Example : Draw to scale the triangle ABC**

with AB = 6cm and angle CAB = 30o and AC = 5cm A Step 1 Draw line AB=6cm Step 2 Measure angle CAB from A C X Step 3 Draw the line AC = 5cm through X. Label it C. A B Step 4 Join C to B. Check angles add to 180o 31-Mar-17 Created by Mr. Lafferty

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**Some practice Teejay Book Page 169 Exercise 1 Drawing SAS Triangles**

31-Mar-17 Created by Mr. Lafferty

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**(ASA) Starter Questions**

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. Q3. List the first 4 prime numbers. Q4. Round the following to nearest 1000. (a) 12,501 (b) 369,765 31-Mar-17 Created by Mr. Lafferty

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**Part 2 : ASA triangles Drawing SAS Triangles 31-Mar-17**

Created by Mr. Lafferty

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Drawing ASA Triangles Aim of the Lesson ‘‘We are learning to construct a triangle given two angles and the length of the side in between’. 31-Mar-17 Created by Mr. Lafferty

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**Drawing ASA Triangles ASA Triangles Angle Angle Side 31-Mar-17**

Created by Mr. Lafferty

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**Drawing ASA Triangles Toolkit required Ruler 2. Protractor**

3. Pencil & Paper 31-Mar-17 Created by Mr. Lafferty

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**Drawing ASA Triangles Example : Draw to scale the triangle PQR**

with PQ = 8cm and angle RPQ = 30o and RQP = 40o P Step 1 Draw line PQ Step 2 Measure Angle RPQ from P R Step 3 Measure angle RQP from Q Q P Step 4 Intersection point is R Check angles add to 180o 31-Mar-17 Created by Mr. Lafferty

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**Some practice Teejay Book Page 171 Exercise 2 Drawing ASA Triangles**

31-Mar-17 Created by Mr. Lafferty

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**(SSS) Starter Questions**

Q1. Convert to the 12 hour clock. (a) 17:15 (b) 05:40 Q2. Write down lowest common multiple of 3, 4 , 5. Q3. List the prime numbers between 10 and 20. Q4. Round the following to nearest 100. (a) 13,551 (b) 369,449 31-Mar-17 Created by Mr. Lafferty

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**Part 3 : SSS triangles Drawing SSS Triangles 31-Mar-17**

Created by Mr. Lafferty

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Drawing SSS Triangles Aim of the Lesson ‘‘We are learning to construct a triangle given the length of three sides’. 31-Mar-17 Created by Mr. Lafferty

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**Drawing SSS Triangles SSS Triangles Side Side Side 31-Mar-17**

Created by Mr. Lafferty

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**Drawing SSS Triangles Toolkit required Ruler 2. Compass**

3. Pencil & Paper 31-Mar-17 Created by Mr. Lafferty

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**Drawing SSS Triangles Example : Draw to scale the triangle XYZ**

with XY = 3cm and XZ = 5cm and YZ = 4cm X y Step 1 Draw line XY=3cm Z Step 2 Use your compass to draw part of a circle centre X radius XZ=5cm Step 3 Use your compass to draw part of a circle centre Y radius YZ=4cm X Y Step 4 Intersection point is labelled Z Step 5 Draw in line XZ and YZ to complete triangle Check angles add to 180o 31-Mar-17 Created by Mr. Lafferty

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**Some practice Teejay Book Page 173 Exercise 3 Drawing SSS Triangles**

31-Mar-17 Created by Mr. Lafferty

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