Constructing an angle or
triangle using a Protractor,
Ruler and Pencil.
L.I. We are learning to construct an angle or
triangle using a protractor, ruler and pencil when
we are given measurements to work from.
Constructing an angle.
• Step 1: Read the instructions.
Instructions
Make an angle of 50 °
Constructing an Angle
• Step 2 : Begin by ruling a horizontal line.
Constructing an Angle
• Step 3 : Place centre of Protractor at one end
of line
Constructing an Angle
• Step 4 : Mark 50 ° at edge of protractor.
X
Constructing an Angle
• Step 5 : Rule line from end
of first line to the mark.
X
Constructing an Angle
• Step 6 : Label angle that you have created.
X
50 °
Now try for yourself
1. Create a 45 ° angle
2. Create a 90 ° angle
3. Create a 75 ° angle
4. Create a 30 ° angle
5. Create a 53 ° angle
6. Create a 120 ° angle
7. Create a 133° angle
8. Create a 17 ° angle
9. Create a 101 ° angle
10. Create a 5 ° angle
When you have
finished swap
with a partner
to measure and
mark
Constructing a Triangle.
• Step 1: Read the instructions.
Instructions
Make a triangle, 1 side is 7 cm long, 1 side is 4
cm long and there is an angle of 45 °.
Constructing a Triangle.
• Step 2 : Begin by ruling a line that is equal to
the longer length.
Constructing a Triangle
• Step 3 : Place centre of Protractor at one end
of line
Constructing a Triangle
• Step 4 : Mark 45 ° at edge of protractor.
X
Constructing a Triangle
• Step 5 : Put 0cm mark on same
end of line and line up with
45 ° mark.
X
Constructing a Triangle
• Step 6 : Rule a 4cm line along
the ruler.
X
Constructing a Triangle
• Step 7 : Using the ruler connect end of 4cm
line with other end of the 7cm line to
complete the triangle.
X
Constructing a Triangle
• Step 8 : Label the lines and angles that you
were given measurements for.
X
4cm
45 °
7cm
Now try for yourself
1. Create a triangle with one side 5 cm, one side 10 cm
and an angle of 45 °.
2. Create a triangle with one side 7 cm, one side 8 cm
and an angle of 30 °.
3. Create a triangle with one side 4 cm, one side 9 cm
and an angle of 50 °.
4. Create a triangle with one side 2 cm, one side 7 cm
and an angle of 80 °.
5. Create a triangle with one side 6 cm, one side 9 cm
and an angle of 15 °.
When you have finished swap
with a partner to measure
and mark