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Drawing Triangles

1. Using a Protractor

2. Select SAS triangles

3. Select ASA triangles

www.mathsrevision.com

4. Select SSS triangles

(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

A 180o Protractor

1. Look directly down onto the cross point.

2. Always use the protractor in a horizontal

manner as shown below.

?

Measuring Angles with a 180o Protractor

50o

67o

Measuring Angles with a 180o Protractor

120o

135o

Drawing SAS Triangles

Aim of the Lesson

To construct a triangle given the length of two

sides and the included angle

Drawing SAS Triangles

SAS Triangles

Side

Side

Angle

Drawing SAS Triangles

Toolkit required

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 AB6cm

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

Drawing SAS Triangles

Some practice Teejay Book Page 169 Exercise 1

(ASA) Starter Questions

Q1. Convert to the 24 hour clock.

(b) 650 am

(a) 725 pm

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

Drawing SAS Triangles

Part 2 ASA triangles

Drawing ASA Triangles

Aim of the Lesson

To construct a triangle given two angles and

the length of the side in between.

Drawing ASA Triangles

ASA Triangles

Angle

Angle

Side

Drawing ASA Triangles

Toolkit required

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

Drawing ASA Triangles

Some practice Teejay Book Page 171 Exercise 2

(SSS) Starter Questions

Q1. Convert to the 12 hour clock.

(b) 0540

(a) 1715

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

Drawing SSS Triangles

Part 3 SSS triangles

Drawing SSS Triangles

Aim of the Lesson

To construct a triangle given the length of

three sides.

Drawing SSS Triangles

SSS Triangles

Side

Side

Side

Drawing SSS Triangles

Toolkit required

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 XY3cm

Z

Step 2 Use your compass to draw part of a

circle centre X radius XZ5cm

Step 3 Use your compass to draw part of a circle

centre Y radius YZ4cm

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

Drawing SSS Triangles

Some practice Teejay Book Page 173 Exercise 3

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