Page 94 - Knowledge Organiser Yr9 24-25

Knowledge Base: Mathematics Topic 26: Constructions Year 9 | Autumn Term, 1st Half
By the end of this topic you should be able to:
• Construct using a ruler and a protractor
• Understand and use perpendicular lines
• Construct SAS, ASA, SSS and RHS triangles
• Construct perpendiculars
• Construct 30°, 45°, 60° and 90° angles
• Construct Loci
Language
Meaning
Example
Construct
To form an angle or shape accurately.
This is a construction of a triangle with Side lengths of 3cm, 4cm and 5cm.
Bisector
A number that counts the terms, in order, starting from 1.
This is a bisector of an angle.
Perpendicular
A line that divides an angle or another line in half.
AB and CD are perpendicular.
Locus
Two lines are perpendicular to each other if they meet at a right angle.
This is the locus
of points equidistant from a line.
Important things to remember:
1) You will need a pencil, ruler, compass and protractor 2) Leave all your construction marks in
Worked examples
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