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# Compass Constructions

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by

## Mr Mattock

on 8 October 2016

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#### Transcript of Compass Constructions

Compass Constructions
Main Activity 1
With only a straight edge and compass, construct:

(a)
A scalene triangle with an angle of 30 degrees.

(Hint construct an equilateral triangle first)
(b)
A right-angled triangle with an angle of 30
degrees.

(Hint, construct (a) and use a 60 degree angle)
(c)
A square.
L.O. - Construct with compasses.
Perpendicular Bisectors
Perpendiculars Bisectors
2 equal sections
Angle Bisectors
Angle Bisectors
Key
Examples

Activities
Activity

Worked
Example
Worked
Example
Triangle constructions
Construct an equilateral triangle using this line as a base.
Triangle constructions
Construct an equilateral triangle using this line as a base.
Worked
Example
Triangle constructions
Draw a triangle with sides 3 cm, 4 cm and 5 cm.
Triangle constructions
Draw a triangle with sides 3 cm, 4 cm and 5 cm.
5 cm
3 cm
4 cm
Worked
Example
Starter

57 >> ÷ 3 , + 5 , ÷ 6 , square , x 5 , - 2 , ÷ 2 , + 3 , ÷ 7 ………….

27 >> ÷ 3 , + 9 , ÷ 3 , square , x 2 , - 4 , ÷ 2 , + 8 , ÷ 7 ………….

87 >> ÷ 3 , + 13 , ÷ 6 , square , x 2 , - 18 , ÷ 4 , + 8 , ÷ 4 ………….

56 >> ÷ 8 , + 5 , ÷ 6 , square , x 9 , - 8 , ÷ 2 , + 4 , ÷ 3 ………….

56 >> ÷ 7 , + 16 , ÷ 4 , square , x 2 , + 9 , ÷ 9 , + 3 , ÷ 2 ………….
Starter

57 >> ÷ 3 , + 5 , ÷ 6 , square , x 5 , - 2 , ÷ 2 , + 3 , ÷ 7 …
6
.

27 >> ÷ 3 , + 9 , ÷ 3 , square , x 2 , - 4 , ÷ 2 , + 8 , ÷ 7 …
6
.

87 >> ÷ 3 , + 13 , ÷ 6 , square , x 2 , - 18 , ÷ 4 , + 8 , ÷ 4 …
7
.

56 >> ÷ 8 , + 5 , ÷ 6 , square , x 9 , - 8 , ÷ 2 , + 4 , ÷ 3 …
6
.

56 >> ÷ 7 , + 16 , ÷ 4 , square , x 2 , + 9 , ÷ 9 , + 3 , ÷ 2 …
6
.
Full transcript