1. We
Are
Learning
Today
How to Construct a triangle using 3 different methods.
This will involve strengthening your knowledge and understanding of how to use compasses and a protractor

2. What I’m Looking for Cooperation Effort and a wanting to understand
Patience with those who find it difficult.
Wanting to learn.
You can accurately set and use compasses
You can accurately read and use a protractor

3. Vocabulary Compasses Scribe Protractor Arc Construct
S S S (Side, side, side)
S S A (Side, side, angle)
S A A (Side angle, angle)

4. Morning Math:
Name these types of triangles (SSS, SAA, SAS)

5. Construct a triangle ABC with side lengths AB = 9cm, AC = 5cm and BC = 7cm.
Draw a 9cm line and label the ends A and B. This is the line AB.
Set your compass to 5cm and with the point on A draw an arc.
Set your compass to 7cm and with the point on B draw an arc.
Label this point C and join A to C then B to C to get the lines AC and BC.

6. Construct a triangle PQR with lines PQ = 8cm, QR = 5cm and PQR = 40°.
40° P Q
8cm
Draw an 8cm line and label the ends P and Q. This is the line PQ.
Place the centre of the angle measurer on Q with the 0° line pointing to P.
Measure a 40° angle clockwise from 0°. Mark it with a dot.
Draw a 5cm line from Q through the dot. Label the end of this line R.
Join up P and R to complete the triangle.

7. Construct a triangle PQR with lines PQ = 8cm, PQR = 40° and RPQ = 30°. .
30°
40° P
8cm Q
Draw an 8cm line and label the ends P and Q. This is the line PQ.
Place the centre of the angle measurer on Q with the 0° line pointing to P.
Measure a 40° angle clockwise from 0°. Mark it with a dot.
Draw a line from Q through the dot.
Place the centre of the angle measurer on P with the 0° line pointing to Q.
Measure a 30° angle anticlockwise from 0°. Complete as with other angle.
Point R is where the two lines meet.