Constructing Perpendicular Bisectors and Lines | I Do, We Do, You Do Year 9 Maths print-free LESSON

Teach perpendicular bisectors and perpendicular lines through a clear I Do, We Do, You Do sequence. This editable Year 9 Maths PowerPoint combines step-by-step construction demonstrations, paired modelling, frequent checks for understanding and differentiated practice in a print-free lesson resource.

PRINT-FREE TEACHING
Project the tasks while pupils work in exercise books or on plain paper with a pencil, ruler and compasses. Pupils draw starting diagrams at a convenient size unless a measurement is specified. No printed worksheet is required. Pupils retain their construction arcs so that methods can be discussed and checked.

I DO, WE DO, YOU DO
Model the perpendicular bisector of a segment, a perpendicular through a point on a line and a perpendicular from a point off a line. Staged demonstrations and worked diagrams make the order of each construction explicit. Matched examples support teacher modelling and shared practice before pupils apply the methods independently. The lesson also explores constructing a parallel through a point.

ASSESSMENT FOR LEARNING
Six retrieval questions activate prior knowledge. Twenty AFL question-and-answer pairs check understanding across different line orientations and point positions. Guided practice, minimal-difference questions, exam-style tasks and exit questions provide further opportunities to identify pupils who need another model or explanation. Answer slides support immediate feedback.

DIFFERENTIATED PRACTICE
Developing offers eight questions, Secure offers eight and Greater Depth offers five, followed by a Super Challenge. Tasks move from using standard constructions towards reasoning about equal distances, parallel lines, finding a circle’s centre and constructing a 45-degree angle. Teachers can select the appropriate starting point and pace for their class.

MISCONCEPTIONS MADE VISIBLE
Address compass openings that are too small, changing the opening between endpoints, confusing a perpendicular with a perpendicular bisector and relying on measurement instead of construction. Pupils consider why equal-radius arcs matter and explain what happens when different compass openings are used. The Super Challenge connects accurate construction with the equal-distance property of the perpendicular bisector.

WHAT IS INCLUDED?
An editable 152-slide PowerPoint, a 4:3 lesson thumbnail and this combined TES title and description. The deck includes questions, worked answers and embedded construction demonstrations. The main construction methods correspond to Sparx topic U245; extension tasks broaden the reasoning.

A practical, print-free resource with clear modelling, differentiated tasks, AFL and explicit attention to misconceptions. Pupils need their own drawing equipment; check the embedded animations in your classroom PowerPoint setup before teaching.