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Drawing Triangles

Drawing Triangles. Using a Protractor. SAS triangles. ASA triangles. www.mathsrevision.com. SSS triangles. 80 o. Q3. Calculate the missing angles. (SAS) Starter Questions. Q1. Convert the percentages to fractions. (a) 30%. (b) 60%. Q2. Write down all the factors of 16.

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Drawing Triangles

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  1. Drawing Triangles Using a Protractor SAS triangles ASA triangles www.mathsrevision.com SSS triangles Created by Mr. Lafferty

  2. 80o Q3. Calculate the missing angles. (SAS) Starter Questions 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 Created by Mr. Lafferty

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

  4. 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. 

  5. 1 0 on the inside so use inside scale 2 0 on the outside so use outside scale Measuring Angles with a 180o Protractor 50o 67o

  6. 3 4 0 on the inside so use inside scale 0 on the outside so use outside scale Measuring Angles with a 180o Protractor 120o 135o

  7. Drawing SAS Triangles Learning Intention Success Criteria 1. Understand the steps for drawing SAS triangles. • 1 We are learning how to draw SAS triangles. • Be able to draw • SAS triangles. www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  8. Drawing SAS Triangles SAS Triangles Side Side Angle Created by Mr. Lafferty

  9. Drawing SAS Triangles • Ruler 2. Protractor 3. Pencil & Paper Toolkit required Created by Mr. Lafferty

  10. Drawing SAS Triangles C 30o B 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 Created by Mr. Lafferty

  11. Drawing SAS Triangles Now try TJ2b Ex 1 Ch5 (page 43) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

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

  13. Drawing ASA Triangles Part 2 : ASA triangles Created by Mr. Lafferty

  14. Drawing ASA Triangles Learning Intention Success Criteria 1. Understand the steps for drawing ASA triangles. • 1 We are learning how to draw ASA triangles. • Be able to draw • ASA triangles. www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  15. Drawing ASA Triangles ASA Triangles Angle Angle Side Created by Mr. Lafferty

  16. Drawing ASA Triangles • Ruler 2. Protractor 3. Pencil & Paper Toolkit required Created by Mr. Lafferty

  17. Drawing ASA Triangles R Q 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 Created by Mr. Lafferty

  18. Drawing ASA Triangles Now try TJ2b Ex 2 Ch5 (page 45) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  19. Starter Questions Q1. Convert to the 12 hour clock. (b) 05:59 (a) 15:45 Q2. Write down lowest common multiple of 2, 5. Q3. List the prime numbers between 10 and 20. www.mathsrevision.com Q4. Round the following to nearest 100. (a) 27,942 (b) 99,949 Created by Mr. Lafferty

  20. Drawing SSS Triangles Part 3 : SSS triangles Created by Mr. Lafferty

  21. Drawing SSS Triangles Learning Intention Success Criteria 1. Understand the steps for drawing SSS triangles. • 1 We are learning how to draw SSS triangles. • Be able to draw • SSS triangles. www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  22. Drawing SSS Triangles SSS Triangles Side Side Side Created by Mr. Lafferty

  23. Drawing SSS Triangles • Ruler 2. Compass 3. Pencil & Paper Toolkit required Created by Mr. Lafferty

  24. Drawing SSS Triangles Z X Example : Draw to scale the triangle XYZ with XY = 3cm and XZ = 5cm and YZ = 4cm 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 Created by Mr. Lafferty

  25. Have you updated your Learning Log ? Drawing SSS Triangles Now try TJ2b Ex 3 Ch5 (page 47) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

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